Document:

Exhibit 10.16

MORGAN STANLEY                             1585 BROADWAY
                                           NEW YORK, NY 10036-8293

                                                               November 27, 2007

                      CUSTOMER FX PRIME BROKERAGE AGREEMENT

Ladies and Gentlemen:

      In consideration of Morgan Stanley Capital Group Inc. ("Morgan Stanley")
agreeing to act as prime broker of each entity specified in Annex B attached
hereto (severally, and not jointly, each a "Customer") with respect to Currency
Option Transactions executed by Customer with one or more Executing Dealers and
given up to Morgan Stanley in accordance with the terms of this Agreement,
Customer hereby agrees as follows:

1.          DEFINITIONS

o "Advisor" means any third-party commodity trading advisor listed on Annex B.
If Customer directs Morgan Stanley to accept trading instructions from an
Advisor, unless otherwise agreed in writing, Customer hereby appoints such
Advisor as Customer's agent for the purpose of receiving all communications,
notices and requests for instructions related to this Agreement and the
transactions effectuated pursuant to this Agreement, including, without
limitation, margin calls and any trading information or advice (subject to
Section 6(b) hereof). Advisor is authorized to access and use electronic
services, facilities and information provided electronically, including but not
limited to electronic trading systems, and on behalf of Customer, to agree to
the terms and conditions regarding such use and to enter into electronic trading
agreements. Customer hereby agrees to indemnify and hold Morgan Stanley harmless
from and to pay Morgan Stanley promptly on demand any and all losses arising
from Customer's appointment of Advisor; Morgan Stanley shall be protected in
continuing to act in reliance on the appointment of the Advisor until Morgan
Stanley receives written notice thereof; and termination of the appointment of
the Advisor shall not affect any liability in any way resulting from
transactions initiated prior to such termination. This indemnity is in addition
to (and in no way limits or restricts) any rights which Morgan Stanley may have
under this Agreement.

o "Agreement" means this document along with all executed annexes to this
document.

o "Collateral" means any and all collateral, margin or other credit support
provided by Customer in accordance with and pursuant to the terms of the Master
Agreement between Customer and Morgan Stanley as security for Customer's
obligations under outstanding Customer Currency Option Transactions and other
Currency Option Transactions governed under such Master Agreement, including any
applicable master cross-entity margining and netting agreement.

o "Currency Option Transaction" shall have the meaning set out in the 1998 FX
and Currency Option Definitions as published by the International Swaps and
Derivatives Association, Inc., the Emerging Markets Traders Association and The
Foreign Exchange Committee.

o "Customer Currency Option Transaction" means a Currency Option Transaction
entered into between Customer and Morgan Stanley to offset a Give-Up
Transaction.

o "Dollar Value" means with respect to an amount of currency at any time (i) if
such currency is U.S. Dollars, such amount and (ii) in all other cases, the
amount of U.S. Dollars which could be purchased at the market rate prevailing at
such time against delivery of such amount of currency on a specified settlement
date. Such rate shall be determined by Morgan Stanley (in good faith and in a
commercially reasonable manner) to be the market rate available to Morgan
Stanley at such time in the New York foreign exchange market (or, at the
reasonable election of Morgan Stanley, in the foreign exchange market of any
other financial center in which the currency is traded and which is then open
for business) for the purchase or, as the case may be, sale of one currency
against another currency for delivery on a specified date using the spot or
forward rate as designated in the Notice. If Morgan Stanley is unable to obtain
a market rate pursuant to the preceding sentence, Morgan Stanley will determine
the rate in good faith and in a commercially reasonable manner.

o "Executing Dealers" means dealers in the foreign exchange market, other than
Morgan Stanley, with which Advisor on behalf of Customer executes Give-Up
Transactions, subject to the terms and conditions of this Agreement.

o "Give-Up Agreement" means the Master FX Give-Up Agreement between Morgan
Stanley and each Executing Dealer regarding the execution of Give-Up
Transactions.

o "Give-Up Notice" means a notice in the form attached as an exhibit to the
Give-Up Agreement between Morgan Stanley and an Executing Dealer setting forth
specific limitations and parameters for the execution of Give-Up Transactions by
a particular Advisor on behalf of Customer with such Executing Dealer.

o "Give-Up Transaction" means any Currency Option Transactions that are executed
between Advisor on behalf of Customer and an Executing Dealer and given up to
Morgan Stanley, as prime broker, in accordance with and subject to the terms and
conditions of this Agreement.

o "Master Agreement" means any form of agreement or general terms and conditions
governing Currency Option Transactions between the parties to such Master
Agreement and Collateral, including, without limitation, any master NDO
agreement related to terms and conditions for non-deliverable Currency Option
Transactions in specified currencies and any applicable master cross-entity
margining and netting agreement.

o "Net Daily Settlement Amount" means, with respect to Give-Up Transactions
executed by Advisor on behalf of Customer with an Executing Dealer for any
settlement date, the aggregate amount owed by such Executing Dealer to Morgan
Stanley (excluding Netted Currency Option Transactions) calculated by Morgan
Stanley as follows: (a) for each such Give -Up Transaction (excluding any option
premia that may be owed to Morgan Stanley and assuming the exercise of any
Give-Up Transaction on its expiration date), determine the Dollar Value for each
currency (including USD) owed by such Executing Dealer to Morgan Stanley or owed
by Morgan Stanley to such Executing Dealer under such Give-Up Transaction; (b)
for each currency (including USD), determine the net Dollar Value amount owed by
such Executing Dealer to Morgan Stanley or owed by Morgan Stanley to such
Executing Dealer by summing the Dollar Value of all long and short positions in
such currency as determined pursuant to clause (a) above; and (c) aggregate the
Dollar Value(s) for all currencies determined pursuant to clause (b) in respect
of which such Executing Dealer owes a net aggregate amount to Morgan Stanley.

o "Net Open Position" means, with respect to Give-Up Transactions executed by
Advisor on behalf of Customer with an Executing Dealer, the aggregate amount
owed by such Executing Dealer to Morgan Stanley (excluding Netted Currency
Option Transactions) calculated by Morgan Stanley as follows: (i) determine the
delta equivalent of each leg of the currency pair in respect of each Give-Up
Transaction; (ii) for each currency, aggregate and net the delta equivalents of
amounts in such currency (assuming exercise of each Give-Up Transaction on its
expiration date) deliverable to Morgan Stanley and payable by such Executing
Dealer ; and (iii) aggregate the amounts determined pursuant to clause (ii)
above for each currency with respect to which such Executing Dealer owes a net
aggregate amount to Morgan Stanley.

o "Netted Currency Option Transaction" means a Give-Up Transaction that is a
Currency Option Transaction sold by Morgan Stanley and owned by an Executing
Dealer that may be discharged and terminated together with a Give-Up Transaction
that is a Currency Option Transaction sold by such Executing Dealer and owned by
Morgan Stanley upon satisfying the following criteria:

      (i)   each Currency Option Transaction being with respect to the same put
            currency and call currency;

      (ii)  each having the same expiration date and expiration time;

      (iii) each being of the same style (i.e., either both being American style
            of both being European style);

      (iv)  each having the same strike price;

      (v)   each being transacting by the same pair of offices of such Executing
            Dealer and Morgan Stanley; and

      (vi)  neither of which shall have been exercised by delivery of a notice
            of exercise.

Where the relevant Currency Option Transactions are for different amounts of the
currency pair, only the portion of such Currency Option Transactions that is
partially discharged and terminated shall be considered a Netted Currency Option
Transaction for purposes of calculating Net Daily Settlement Amount and Net Open
Position.

2. MORGAN STANLEY AS PRIME BROKER. In connection with any Currency Option
Transactions where Morgan Stanley acts as prime broker for the Customer:

(a) Advisor on behalf of Customer may execute Give-Up Transactions only with
Executing Dealers that have been approved by Morgan Stanley, at its discretion,
for the execution of Give-Up Transactions with Customer and that have entered
into a Give-Up Agreement, a Give-Up Notice with respect to Customer, and a
Master Agreement with Morgan Stanley, and provided that Customer has posted a
sufficient minimum amount of Collateral pursuant to the terms of the Master
Agreement between Morgan Stanley and Customer prior to the execution of any
Give-Up Transaction with any Executing Dealer. Advisor on behalf of Customer
shall not be permitted to execute Give-Up Transactions with more than fifteen
Executing Dealers at any given time. Morgan Stanley may terminate its approval
of any Executing Dealer at any time and in its sole discretion, provided that
Morgan Stanley promptly notifies Customer and Advisor of any such determination
to terminate approval. Such termination shall be effective with respect to any
Currency Option Transactions executed by Customer with such Executing Dealer
after the giving of such notice.

(b) Customer understands that Morgan Stanley will only accept Give-Up
Transactions executed by Advisor on behalf of Customer with an Executing Dealer
that are within the limitations and parameters set forth in the corresponding
Give-Up Notice (a copy of which shall be provided to Customer and Advisor by
Morgan Stanley) to the Give-Up Agreement for such Customer with such Executing
Dealer and provided that Customer has posted with Morgan Stanley a sufficient
amount of Collateral, to be determined in Morgan Stanley's reasonable discretion
based on market indicia, to cover the initial exposure for Customer Currency
Option Transactions related to such Give-Up Transactions. If Advisor on behalf
of Customer executes a Give-Up Transaction with an Executing Dealer that exceeds
the limitations set forth in the applicable Give-Up Notice, Morgan Stanley shall
have the right to reject such transaction; provided, however, that Morgan
Stanley reserves the right, in its sole discretion, to accept any Give-Up
Transactions that exceed the prescribed limitations, to accept and assign such
Give-Up Transaction to a third party, to close-out and liquidate outstanding
Customer Currency Option Transactions and other Currency Option Transactions
entered into with Customer, and/or to request that Customer provide additional
Collateral to Morgan Stanley in connection with such Give-Up Transaction. If
Morgan Stanley rejects a Give-Up Transaction executed by Advisor on behalf of
Customer with an Executing Dealer, Customer acknowledges and agrees that Morgan
Stanley shall have no liability, whether in contract, tort or otherwise, to
Customer or Advisor or the Executing Dealer with respect to such Give-Up
Transaction, and that such rejected transaction shall be for the sole account
and risk of Customer and subject to the terms and conditions of the Master
Agreement (if any) between Customer and such Executing Dealer.

(c) Subject to the terms and conditions set forth herein, Morgan Stanley agrees
to enter into a Customer Currency Option Transaction with Advisor on behalf of
Customer to offset each applicable Give-Up Transaction executed by Advisor on
behalf of Customer with an Executing Dealer, provided that Morgan Stanley does
not reject such Give-Up Transaction and Customer has posted any upfront
Collateral as may be requested by Morgan Stanley in its sole discretion with
respect to such Customer Currency Option Transaction. The terms of each such
Customer Currency Option Transaction shall be identical to the corresponding
Give-Up Transaction. Without limitation of the foregoing, Morgan Stanley may
exercise any and all rights and remedies afforded to it under the applicable
Master Agreement in connection with any Customer Currency Option Transaction,
including but not limited to, the right to liquidate any such Customer Currency
Option Transaction in accordance with and pursuant to the terms and conditions
of the Master Agreement between Customer and Morgan Stanley. In addition, any
Customer Currency Option Transactions shall be subject to the provisions of such
Master Agreement regarding Customer's obligation to deposit and maintain
Collateral. Any Collateral delivered to Morgan Stanley by Customer in connection
with Customer Currency Option Transactions shall be subject in all respects to
the terms and conditions of such Master Agreement, and Morgan Stanley shall be
entitled to exercise any and all rights and remedies afforded to it under such
Master Agreement with respect to such Collateral. In the event of a conflict
between this Agreement and such Master Agreement with respect to any Customer
Currency Option Transaction, the terms of this Agreement will control.

(d) Advisor on behalf of Customer shall provide Morgan Stanley with written
notice of the details of each Give-Up Transaction promptly upon executing such
Give-Up Transaction (the "Trade Details"). Such notification may be made by
Advisor either by (i) transmitting such Trade Details directly in written form
to Morgan Stanley or (ii) affirming the Trade Details transmitted by Morgan
Stanley to Advisor on behalf of Customer, in each case, through Morgan Stanley's
electronic or web-based proprietary systems or services. In the event that
Advisor fails to provide such written notice to Morgan Stanley on a timely
basis, Morgan Stanley shall have the right, in its sole discretion, to reject
such Give-Up Transaction or to execute the corresponding Customer Currency
Option Transaction in accordance with the terms submitted to Morgan Stanley by
the relevant Executing Dealer; provided, however, that Morgan Stanley shall use
reasonable efforts to notify Advisor of missing Trade Details.

(e) In the event that Advisor on behalf of Customer notifies Morgan Stanley of
the Trade Details of any Give-Up Transaction in accordance with subparagraph (d)
above but the terms set forth in such notice differ from the Trade Details of
the Give-Up Transaction reflected in the notice submitted to Morgan Stanley by
the applicable Executing Dealer, Morgan Stanley shall have the right, in its
discretion, to reject such Give-Up Transaction or, notwithstanding anything
herein to the contrary, to delay acceptance of such Give-Up Transaction unless
and until the discrepancies between the notices submitted by Advisor and the
Executing Dealer are reconciled. Advisor understands that it shall be
responsible for resolving discrepancies in Trade Details with respect to any
Give-Up Transaction and that Morgan Stanley's acceptance of any Give-Up
Transaction is conditional on the satisfactory resolution of such discrepancies
between Advisor and the relevant Executing Dealer. Customer acknowledges and
agrees that Morgan Stanley shall have no liability, whether in contract, tort or
otherwise, to Customer or the Executing Dealer with respect to any delays in
accepting a Give-Up Transaction if such delays result from discrepancies in
Trade Details, unless arising from or related to Morgan Stanley's negligence or
misconduct.

(f) Advisor on behalf of Customer agrees promptly to either (i) execute and
return hard-copy Confirmations provided by Morgan Stanley to Customer with
respect to a Customer Currency Option Transaction, or (ii) to electronically
affirm Confirmations transmitted to Customer through Morgan Stanley's electronic
or web-based proprietary systems or services. Confirmations shall be conclusive
and binding if not objected to in writing within three days after transmittal by
Morgan Stanley to Customer. For purposes hereof, "Confirmation" shall have the
meaning ascribed to it in the Master Agreement entered into between Customer and
Morgan Stanley and may be included within or as part of the Trade Details of the
Give-Up Transaction that Morgan Stanley provides to Customer electronically
through its web-based proprietary systems or services. In the event of any
inconsistency with respect to the terms contained in any Confirmation provided
by Morgan Stanley for a Customer Currency Option Transaction that is a
Non-Deliverable Currency Option Transaction and the Trade Details of the
corresponding accepted Give-Up Transaction provided by the relevant Executing
Dealer, the terms of the Trade Details of the Give-Up Transaction shall prevail.

(g) Customer acknowledges that, notwithstanding the foregoing, Morgan Stanley
shall be under no obligation whatsoever to accept Give-Up Transactions executed
by Advisor on behalf of Customer with Executing Dealers and to enter into
offsetting Customer Currency Option Transactions with Customer, except in
accordance with the terms of this Section 2 and Section 3. Customer further
acknowledges that Morgan Stanley shall settle each Customer Currency Option
Transaction on the same terms as the corresponding accepted Give-Up Transaction
between Morgan Stanley and the relevant Executing Dealer and that any waiting
periods, exercise of terms or exotic features, market or other disruption
events, interpretations, market practices, disputes or other events that modify
or otherwise impact the terms of settlement of an accepted Give-Up Transaction
shall equally modify or otherwise impact the terms of settlement of the
corresponding Customer Currency Option Transaction. Customer agrees that Morgan
Stanley shall have no liability, whether in contract, tort or otherwise, to
Customer for any losses attributable to the foregoing risks associated with the
interdependency between Customer Currency Option Transactions and corresponding
accepted Give-Up Transactions. For the avoidance of doubt, the only risk that
Morgan Stanley hereby agrees to assume with respect to Customer Currency Option
Transactions and accepted Give-Up Transactions is credit risk; Customer hereby
agrees to assume all other risks associated with Give-Up Transactions, which
risks Customer agrees Morgan Stanley shall pass through to Customer.

3. LIMITS. Morgan Stanley, from time to time and in its sole discretion, will
establish the maximum permissible Net Open Position and the Net Daily Settlement
Amount that may exist as of any given time with respect to the aggregate of all
Customer Currency Option Transactions with each Executing Dealer that are
outstanding as of such time and will notify Advisor of such limits as soon as
reasonably practicable. In the event that Advisor on behalf of Customer enters
into a Give-Up Transaction that would, if the corresponding Customer Currency
Option Transaction were executed, cause any of such limits to be exceeded,
Morgan Stanley shall have the right, in its sole discretion, to (i) accept such
Give-Up Transaction or reject such Give-Up Transaction (in which latter case, no
Customer Currency Option Transaction shall be established); (ii) accept the
corresponding Customer Currency Option Transaction subject to Customer's prior
deposit of additional Collateral with Morgan Stanley, in a form and amount
specified by Morgan Stanley in its reasonable discretion based on market
indicia. Morgan Stanley may at any time and in its sole discretion amend the
Give-Up Notice governing the limits and other parameters with which Advisor on
behalf of Customer may execute Give-Up Transactions with any Executing Dealer by
notifying Customer and Advisor as soon as reasonably practicable. Any amendments
to a Give-Up Notice with an Executing Dealer, copies of which shall be provided
to Customer by Morgan Stanley, may serve to terminate Advisor on behalf of
Customer's ability to execute Give-Up Transactions with such Executing Dealer or
reduce the volume of Give-Up Transactions permissible under such Give-Up Notice
to zero. Amendments to the Give-Up Notice shall be effective after the giving of
such notice by Morgan Stanley with respect to Give-Up Transactions executed
subsequent to such notice.

4. FEES AND OTHER CHARGES. Customer agrees to pay to Morgan Stanley as
compensation for Morgan Stanley acting as prime broker hereunder, as of the end
of each calendar month during the term of this Agreement, the fees specified in
Annex A hereto. Morgan Stanley may modify the terms of Annex A at any time and
from time to time, and such modified terms shall be applicable to all Give-Up
Transactions executed after the date of such modification, provided that, Morgan
Stanley provides Customer with notice of such modification. Fees due to Morgan
Stanley hereunder shall be paid to the account specified by Morgan Stanley
within 30 days of Customer's receipt of an invoice from Morgan Stanley
identifying the fees due for the preceding month.

5. REPRESENTATIONS AND WARRANTIES. Customer represents and warrants that (a) it
has full power and authority to execute this Agreement and the persons executing
this Agreement have been duly authorized to do so; (b) this Agreement is binding
upon it and enforceable against it in accordance with its terms (subject to
applicable bankruptcy, reorganization, insolvency, moratorium or similar laws
affecting creditors' rights generally and subject, as to enforceability, to
equitable principals of general application (regardless of whether enforcement
is sought in a proceeding in equity or at law)) and does not and will not
violate the terms of any agreements to which Advisor on behalf of Customer is
bound; (c) it understands and is prepared to accept all of the risks of
executing Give-Up Transactions with the Executing Dealers, (d) it is solely
responsible for the selection of the Executing Dealers and Morgan Stanley has no
responsibility therefor; (e) Morgan Stanley has no responsibility or liability
for any acts or omissions of the Executing Dealers or for any other matters
related to the execution of Give-Up Transactions; and (f) Morgan Stanley is not
acting as a fiduciary of, or an advisor to, Customer in connection with any
Give-Up Transactions, and does not perform any analysis or make any judgment on
any matters pertaining to the suitability of any order or offer any opinion,
judgment or other type of information pertaining to the nature, value, potential
or suitability of any particular Give-Up Transaction or Customer Currency Option
Transaction.

6. TERMINATION. This Agreement shall remain in full force and effect unless and
until terminated by either party upon 30 days' prior written notice to the other
party, provided, however, that the terms and conditions of this Agreement shall
remain in effect and applicable with respect to any Give-Up Transaction and
Customer Currency Option Transactions executed prior to the effective date of
termination and, provided further, that Sections 7 and 8 of this Agreement shall
remain in full force and effect and survive any termination of this Agreement.
In addition, any breach of this Agreement by Customer shall constitute an event
of default, termination event or other similar event as may be defined under the
Master Agreement between Customer and Morgan Stanley, and Morgan Stanley shall
be entitled to exercise any and all of the rights and remedies afforded to it
under such Master Agreement.

7. LIMITATION OF LIABILITY. Morgan Stanley shall not be liable in connection
with the execution, processing or other actions taken in connection with Give-Up
Transactions or Customer Currency Option Transactions, except in the event of
negligence or misconduct on Morgan Stanley's part.

8. INDEMNIFICATION. In consideration of Morgan Stanley's acting as prime broker
for Customer, Customer agrees to indemnify and hold Morgan Stanley harmless from
and against any and all losses, claims, damages and liabilities in connection
with the execution of Give-Up Transactions and Customer Currency Option
Transactions, or in connection with Morgan Stanley acting or declining to act as
prime broker, except for actions taken or omitted to be taken by Morgan Stanley
which are a result of, or constitute, misconduct or negligence. Customer also
agrees that Morgan Stanley shall have no responsibility for Customer's or
Advisor's compliance with any law or regulation and that Morgan Stanley shall
not be liable for delays in the transmission of orders or instructions due to
the breakdown or failure of transmission or communication facilities or any
other cause beyond Morgan Stanley's control, including any mistake, error,
negligence or misconduct of any Executing Dealer or clearing or nostro bank or
agent or their respective officers, directors, employees or agents.

9. NOTICES. All notices required or permitted to be given hereunder shall be
provided to the addresses and in the manner specified in the Master Agreement.

10. SUCCESSORS AND ASSIGNS. The provisions of this Agreement shall be binding
upon and inure to the benefit of any successors or permitted assignees of the
parties, provided that Customer may not assign its rights or obligations under
this Agreement without the express written consent of Morgan Stanley.

11. MISCELLANEOUS. (a) In the event any one or more of the provisions contained
in this Agreement is held invalid, illegal, or unenforceable in any respect
under the law of any jurisdiction, the validity, legality, and enforceability of
the remaining provisions under the law of such jurisdiction, and the validity,
legality, and enforceability of such and any other provisions under the law of
any other jurisdiction, shall not in any way be affected or impaired thereby.
The headings used in this Agreement are for convenience of reference only and
are not to affect the construction of or to be taken into consideration in
interpreting this Agreement.

(b) No indulgence or concession granted by a party and no omission or delay on
the part of a party in exercising any right, power, or privilege under this
Agreement shall operate as a waiver thereof, nor shall any single or partial
exercise of any such right, power, or privilege preclude any other or further
exercise thereof or the exercise of any other right, power, or privilege.

(c) This Agreement shall be governed by, and construed in accordance with, the
laws of the State of New York without giving effect to conflict of laws
provisions. With respect to any suit, action or other proceedings
("Proceedings") related to this Agreement, each party irrevocably (i) submits to
the exclusive jurisdiction of the courts of the State of New York and the United
States District Court located in the Borough of Manhattan in New York City and
(ii) waives any objection which it may have at any time to the laying of venue
of any Proceedings brought in any such court, waives any claim that such
Proceedings have been brought in an inconvenient forum and further waives the
right to object, with respect to such Proceedings, that such court does not have
jurisdiction over such party.

(d) Each party hereby irrevocably waives any and all right to trial by jury in
any Proceedings.

(e) This Agreement (and each amendment, modification and waiver in respect of
it) may be executed and delivered in counterparts, each of which will be deemed
an original.

<PAGE>

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be signed
by their respective officers thereunto duly executed as of the date first
written above.

                             MORGAN STANLEY CAPITAL GROUP INC.

                             By:    /s/ Simon Platel
                                 -----------------------------
                                 Name:  Simon Platel
                                 Title: Authorized Signer

                             DEMETER MANAGEMENT CORPORATION, as general partner
                             and/or trading manager for each entity listed in
                             Annex B attached hereto (severally, and not
                             jointly, each a "Customer")

                             By:     /s/ Walter Davis
                                  ----------------------------
                                  Name:  Walter Davis
                                  Title: President

<PAGE>

                                                                         Annex A
                                  Fee Schedule
                                  ------------

In connection with Morgan Stanley's services as prime broker under the terms of
this Agreement, the following fees shall be payable by Customer:

Deliverable Currency
Option Transactions*: Each Customer (as applicable), hereby agrees to pay Morgan
Stanley a servicing fee in the amount of USD 8.00 per each USD 1 million (or its
equivalent) in notional amount of Give-In Transactions that Advisor enters into
on behalf of the Accounts for the first USD 2 billion in a calendar month. The
fee in the amount of USD 8.00 per each USD 1 million shall be reduced to USD
6.00 per each USD 1 million if the business exceeds USD 2 billion in a given
calendar month. Provided, however, that such fee shall not be payable for any
Customer Transaction that Morgan Stanley rejects or for any foreign exchange
transactions that are executed by Advisor on behalf of the Accounts directly
with Morgan Stanley and not through any Dealer under the terms of a Give-Up
Agreement.

NDOs: Each Customer (as applicable), hereby agrees to pay Morgan Stanley a
servicing fee in the amount of USD 8.00 per each USD 1 million (or its
equivalent) in notional amount of Give-In Transactions that Advisor enters into
on behalf of the Accounts for the first USD 2 billion in a calendar month. The
fee in the amount of USD 8.00 per each USD 1 million shall be reduced to USD
6.00 per each USD 1 million if the business exceeds USD 2 billion in a given
calendar month. Provided, however, that such fee shall not be payable for any
Customer Transaction that Morgan Stanley rejects or for any foreign exchange
transactions that are executed by Advisor on behalf of the Accounts directly
with Morgan Stanley and not through any Dealer under the terms of a Give-Up
Agreement.

All fees shall be payable on a per Customer basis and shall be subject to the
provisions set forth in Section 4 of the Agreement. The fees for notional
amounts that are less than USD $1 million (or the Dollar Value of its
equivalent) shall be pro-rated.

* Limited to Deliverable Currency Option Transactions that are traded by Morgan
Stanley as "vanilla" options (i.e., standard call and put options that are
either American or European style, do not have any special or unusual features,
such as barriers, and for which the pay-off is determined by reference to a
single strike price).

<PAGE>

                                                                         Annex B
                                    Customers
                                    ---------

          Morgan Stanley Spectrum Currency L.P., managed by DKR Fusion
                          Management L.P. (its Advisor)EXHIBIT 4.1

--------------------------------------------------------------------------------

                    WELLS FARGO ASSET SECURITIES CORPORATION
                                   (Depositor)

                                       and

                             WELLS FARGO BANK, N.A.
                                (Master Servicer)

                                       and

                       HSBC BANK USA, NATIONAL ASSOCIATION
                                    (Trustee)

                                 AMENDMENT NO. 1

                          Dated as of December 4, 2007

                                     to the

                         POOLING AND SERVICING AGREEMENT

                            Dated as of June 28, 2007

                       Mortgage Pass-Through Certificates
                                  Series 2007-8

--------------------------------------------------------------------------------

<PAGE>

            AMENDMENT NO. 1, dated as of December 4, 2007 (the "Amendment"), to
the Pooling and Servicing Agreement, dated as of June 28, 2007 (the
"Agreement"), among WELLS FARGO ASSET SECURITIES CORPORATION, as depositor (the
"Depositor"), WELLS FARGO BANK, N.A., as master servicer (the "Master
Servicer"), and HSBC BANK USA, NATIONAL ASSOCIATION, as trustee (the "Trustee").

            WHEREAS, HSBC Securities (USA) Inc. ("HSBC Securities"), as
underwriter of the Classes of Certificates offered by the base prospectus, dated
June 25, 2007, as supplemented by the prospectus supplement, dated June 27, 2007
(together with the base prospectus, the "Prospectus"), and supplement, dated
June 28, 2007 (together with the Prospectus, the "Supplemented Prospectus"),
intended to structure the Class I-A-3 Certificates as a Class of Super Senior
Certificates (as defined in the Supplemented Prospectus), with its share of the
principal portion of Realized Losses on each Distribution Date after the
Subordination Depletion Date to be borne by the Class I-A-4 Certificates.

            WHEREAS, HSBC Securities desires that the Depositor, the Master
Servicer and the Trustee enter into this Amendment.

            WHEREAS, Section 10.01(a) of the Agreement provides, among other
things, that the Depositor, the Master Servicer and the Trustee may amend the
Agreement subject to certain provisos.

            WHEREAS, Cede & Co., as nominee for The Depository Trust Company, is
the Holder of the Class I-A-4 Certificates, evidencing 100% of the aggregate
Voting Interest of such Class of Certificates, and it has consented to this
Amendment.

            WHEREAS, the Depositor, the Master Servicer and the Trustee agree to
amend the Agreement, as set forth in this Amendment.

            NOW THEREFORE, in consideration of the mutual agreements herein
contained, the Depositor, the Master Servicer and the Trustee agree as follows:

            All terms used in this Amendment which are defined in the Agreement,
either directly or by reference therein, have the meanings assigned to them
therein, except to the extent such terms are defined or modified in this
Amendment or the context clearly requires otherwise.

            Section 1. Amendment of Section 1.01.

            (a) The following definitions are hereby added to read in their
entirety as follows:

            Class I-A-3 Loss Amount: With respect to any Determination Date
after the Subordination Depletion Date, the amount, if any, by which the
Principal Balance of the Class I-A-3 Certificates would be reduced as a result
of the application of the third sentence of the definition of Principal Balance.

            Class I-A-4 Loss Allocation Amount: With respect to any
Determination Date after the Subordination Depletion Date the lesser of (a) the
Principal Balance of the Class I-A-4 Certificates with respect to such
Determination Date prior to any reduction for the Class I-A-4 Loss Allocation
Amount and (b) the Class I-A-3 Loss Amount.

            (b) The first paragraph of the "Principal Balance" definition is
hereby amended to read in its entirety as follows:

            As of the first Determination Date and as to any Class of Class A
Certificates (other than a Class of Exchangeable Certificates or Interest Only
Certificates or the Class A-PO Certificates) or Component, the Original
Principal Balance or, in the case of a Class of Exchangeable REMIC Certificates,
the Maximum Initial Principal Balance, of such Class or Component. As of any
subsequent Determination Date prior to the Subordination Depletion Date and as
to any Class of Class A Non-PO Certificates (other than a Class of Interest Only
Certificates), the Original Principal Balance (increased in the case of a Class
of Accrual Certificates by the applicable Accrual Distribution Amounts with
respect to prior Distribution Dates) or, in the case of a Class of Exchangeable
REMIC Certificates, the Maximum Initial Principal Balance of such Class, less
the sum of all amounts previously allocated to such Class on prior Distribution
Dates (i) pursuant to Paragraph third clauses (A)(1) and (B)(1) of Section
4.01(a)(i), as applicable, (ii) pursuant to the provisos in Paragraphs first
clause (A) and second clause (A) and first clause (B) and second clause (B) of
Section 4.01(a)(i), as applicable, (iii) pursuant to clause (iii) of Section
4.01(b) and (iv) as a result of a Principal Adjustment. After the Subordination
Depletion Date, each such Principal Balance of a Class of Class A Non-PO
Certificates will also be reduced (if clause (a) is greater than clause (b)) or
increased (if clause (a) is less than clause (b)) on each Determination Date by
an amount equal to the product of the Group I-A Loss Percentage or Group II-A
Loss Percentage, as applicable, of such Class and the difference, if any,
between (a) the Group I-A Non-PO Principal Balance or Group II-A Non-PO
Principal Balance, as applicable, as of such Determination Date without regard
to this sentence and (b) the Group I Adjusted Pool Amount (Non-PO Portion) or
Group II Adjusted Pool Amount (Non-PO Portion), as applicable, for the preceding
Distribution Date; provided, however, that the amount of any such reduction for
the Class I-A-3 Certificates will be decreased by the Class I-A-4 Loss
Allocation Amount, the amount of any such reduction for the Class I-A-13 and
Class I-A-14 Certificates will be decreased by the Class I-A-15 Loss Allocation
Amount and the amount of any such reduction for the Class II-A-2, Class II-A-7,
Class II-A-8, Class II-A-9 and Class II-A-11 Certificates will be decreased by
the Class II-A-3 Loss Allocation Amount. After the Subordination Depletion Date,
the Principal Balance for the Class I-A-4 Certificates will additionally be
reduced by the Class I-A-4 Loss Allocation Amount, the Principal Balance for the
Class I-A-15 Certificates will additionally be reduced by the Class I-A-15 Loss
Allocation Amount and the Principal Balance for the Class II-A-3 Certificates
will additionally be reduced by the Class II-A-3 Loss Allocation Amount. In
addition, any increase allocated to the Class I-A-3 Certificates pursuant to the
third sentence above will instead increase the Principal Balance of the Class
I-A-4 Certificates, any increase allocated to the Class I-A-13 and Class I-A-14
Certificates pursuant to the third sentence above will instead increase the
Principal Balance of the Class I-A-15 Certificates and any increase allocated to
the Class II-A-2, Class II-A-7, Class II-A-8, Class II-A-9 and Class II-A-11
Certificates pursuant to the third sentence above will instead increase the
Principal Balance of the Class II-A-3 Certificates. Notwithstanding the
foregoing, on any Distribution Date in which the sum of the Class I-A-13 Loss
Amount and Class I-A-14 Loss Amount exceeds the Principal Balance of the Class
I-A-15 Certificates prior to any reduction for the Class I-A-15 Loss Allocation
Amount, such excess will be allocated, pro rata, based on the Class I-A-13 Loss
Amount and Class A-14 Loss Amount, in reduction of the Principal Balances of the
Class I-A-13 and Class I-A-14 Certificates and notwithstanding the foregoing, on
any Distribution Date in which the sum of the Class II-A-2 Loss Amount, Class
II-A-7 Loss Amount, Class II-A-8 Loss Amount, Class II-A-9 Loss Amount and Class
II-A-11 Loss Amount exceeds the Principal Balance of the Class II-A-3
Certificates prior to any reduction for the Class II-A-3 Loss Allocation Amount,
such excess will be allocated, pro rata, based on the Class II-A-2 Loss Amount,
Class II-A-7 Loss Amount, Class II-A-8 Loss Amount, Class II-A-9 Loss Amount and
Class II-A-11 Loss Amount, in reduction of the Principal Balances of the Class
II-A-2, Class II-A-7, Class II-A-8, Class II-A-9 and Class II-A-11 Certificates.

            Section 2. Amendment of Section 11.17. The first two sentences of
Section 11.17 of the Agreement are hereby amended by deleting them in their
entirety and replacing them with the following:

            A Single Certificate for the Class A Certificates (other than the
Class I-A-4, Class I-A-8, Class I-A-14, Class I-A-15, Class I-A-23, Class
II-A-3, Class II-A-4, Class II-A-12, Class II-A-13, Class II-A-14, Class
II-A-15, Class A-PO and Residual Certificates) represents a $25,000
Denomination. A Single Certificate for the Class I-A-4, Class I-A-14, Class
I-A-15, Class I-A-23, Class II-A-3, Class II-A-13, Class II-A-14, Class II-A-15,
Class A-PO, Class B-1, Class B-2 and Class B-3 Certificates represents a
$100,000 Denomination.

            Section 3. Amendment of Exhibit A-I-A-4. Exhibit A-I-A-4 to the
Agreement is hereby amended by deleting it in its entirety and replacing it with
Exhibit A-I-A-4 attached hereto.

            Section 4. Counterparts. This Amendment may be executed in any
number of counterparts, each of which when so executed shall be deemed to be an
original, but all of such counterparts shall together constitute but one and the
same instrument.

            Section 5. Ratification of Agreement. Except as modified and
expressly amended by this Amendment, the Agreement is in all respects ratified
and confirmed, and all the terms, provisions and conditions thereof shall be and
remain in full force and effect.

            Section 6. Governing Law; Jurisdiction. This Amendment shall be
construed in accordance with the laws of the State of New York (without regard
to conflicts of laws principles), and the obligations, rights and remedies of
the parties hereunder shall be determined in accordance with such laws.

<PAGE>

            IN WITNESS WHEREOF, the Depositor, the Master Servicer and the
Trustee have caused their names to be signed hereto by their respective officers
thereunto duly authorized, all as of the day and year first above written.

                                    WELLS FARGO ASSET SECURITIES CORPORATION
                                        as Depositor

                                    By:  /s/ Bradley A. Davis
                                       -----------------------------------------
                                       Name:  Bradley A. Davis
                                       Title: Vice President

                                    WELLS FARGO BANK, N.A.
                                        as Master Servicer

                                    By:  /s/ Joshua Kelly
                                       -----------------------------------------
                                       Name:  Joshua Kelly
                                       Title: Vice President

                                    HSBC BANK USA, NATIONAL ASSOCIATION
                                        as Trustee

                                    By:  /s/ Alexander Pabon
                                       -----------------------------------------
                                       Name: Alexander Pabon
                                       Title: Vice President

<PAGE>

STATE OF MARYLAND       )
                         ss.:
COUNTY OF FREDERICK     )

            On the 4th day of December, 2007 before me, a notary public in and
for said State, personally appeared Bradley A. Davis, known to me to be a Vice
President of Wells Fargo Asset Securities Corporation, a Delaware corporation,
that executed the within instrument, and also known to me to be the person who
executed it on behalf of said corporation, and acknowledged to me that such
corporation executed the within instrument.

            IN WITNESS WHEREOF, I have hereunto set my hand and affixed my
official seal the day and year in this certificate first above written.

                                       Notary Public

<PAGE>

STATE OF MARYLAND       )
                              ss.:
COUNTY OF HOWARD        )

            On the 4th day of December, 2007, before me, the undersigned
officer, personally appeared Joshua Kelly, and acknowledged to me to be a Vice
President of Wells Fargo Bank, National Association, and that as such officer,
being duly authorized to do so pursuant to such entity's by-laws or a resolution
of its board of directors, executed and acknowledged the foregoing instrument
for the purposes therein contained, by signing the name of such entity by
himself as such officer as his free and voluntary act and deed and the free and
voluntary act and deed of said entity.

            IN WITNESS WHEREOF, I hereunto set my hand and official seal.

-------------------------
Notary Public

[NOTARIAL SEAL]

<PAGE>

STATE OF NEW YORK       )
                        ) ss.:
COUNTY OF NEW YORK      )

            On the 4th day of December, 2007, before me, a notary public in and
for the State of New York, personally appeared Alexander Pabon, known to me who,
being by me duly sworn, did depose and say that he is a Vice President of HSBC
Bank USA, National Association, a national banking association, one of the
parties that executed the foregoing instrument; and that he signed his name
thereto by order of the Board of Directors of said association.

            IN WITNESS WHEREOF, I have hereunto set my hand and affixed my
official seal the day and year in this certificate first above written.

                                       Notary Public

<PAGE>

                                 EXHIBIT A-I-A-4
                    [FORM OF FACE OF CLASS I-A-4 CERTIFICATE]

  [UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
   DEPOSITORY TRUST COMPANY TO THE DEPOSITOR OR ITS AGENT FOR REGISTRATION OF
   TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN
     THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS REQUESTED BY AN AUTHORIZED
    REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY AND ANY PAYMENT IS MADE TO
   CEDE & CO., ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE
    BY OR TO ANY PERSON IS WRONGFUL SINCE THE REGISTERED OWNER HEREOF, CEDE &
                          CO., HAS AN INTEREST HEREIN.]

                        MORTGAGE PASS-THROUGH CERTIFICATE
                           SERIES 2007-8, CLASS I-A-4

                    evidencing an interest in a pool of fixed
                           interest rate, monthly pay,
                               first lien, one- to
                 four-family residential mortgage loans sold by

                    WELLS FARGO ASSET SECURITIES CORPORATION
               (Not an interest in or obligation of the Depositor)

            THIS CERTIFICATE IS AN EXCHANGEABLE REMIC CERTIFICATE AS DESCRIBED
IN THE AGREEMENT REFERENCED HEREIN.

            AFTER THE SUBORDINATION DEPLETION DATE, THE PRINCIPAL PORTION OF
REALIZED LOSSES ALLOCATED TO THE CLASS I-A-3 CERTIFICATES WILL BE BORNE BY THE
CLASS I-A-4 CERTIFICATES AS DESCRIBED IN THE AGREEMENT.

            THIS CERTIFICATE DOES NOT EVIDENCE AN OBLIGATION OF, OR AN INTEREST
IN, THE DEPOSITOR, THE MASTER SERVICER, THE TRUSTEE OR ANY OF THEIR AFFILIATES,
AND IS NOT INSURED OR GUARANTEED BY THE DEPOSITOR, THE MASTER SERVICER, THE
TRUSTEE OR ANY OF THEIR AFFILIATES, OR BY ANY GOVERNMENT AGENCY OR PRIVATE
INSURER.

            DISTRIBUTIONS IN REDUCTION OF THE PRINCIPAL BALANCE OF THIS
CERTIFICATE WILL BE MADE IN THE MANNER DESCRIBED IN THE AGREEMENT. ACCORDINGLY,
THE OUTSTANDING PRINCIPAL BALANCE OF THIS CERTIFICATE AT ANY TIME MAY BE LESS
THAN THE MAXIMUM INITIAL PRINCIPAL BALANCE REPRESENTED HEREBY.

Certificate No.                           Cut-Off Date: June 1, 2007

CUSIP No.: 94986A AD0                     First Distribution Date: July 25, 2007

ISIN No.: US94986AAD00                    Denomination: $

Percentage Interest evidenced             Maximum Initial Principal
by this Certificate: %                    Balance: $

Final Scheduled Maturity Date: July 25,
2037

<PAGE>

            THIS CERTIFIES THAT ___________________________ is the registered
owner of the Percentage Interest evidenced by this Certificate in monthly
distributions to the Holders of the Class I-A-4 Certificates with respect to a
Trust Estate consisting of a pool of fixed interest rate, monthly pay, first
lien, one- to four-family residential mortgage loans, other than the Fixed
Retained Yield, if any, with respect thereto, consisting of two loan groups (the
"Group I Mortgage Loans" and "Group II Mortgage Loans," respectively), formed by
Wells Fargo Asset Securities Corporation (hereinafter called the "Depositor,"
which term includes any successor entity under the Agreement referred to below).
The Trust Estate was created pursuant to a Pooling and Servicing Agreement dated
as of June 28, 2007 (the "Agreement") among the Depositor, Wells Fargo Bank,
N.A., as master servicer (the "Master Servicer") and HSBC Bank USA, National
Association, as trustee (the "Trustee"), a summary of certain of the pertinent
provisions of which is set forth hereinafter. To the extent not defined herein,
the capitalized terms used herein have the meanings ascribed to such terms in
the Agreement. This Certificate is issued under and is subject to the terms,
provisions and conditions of the Agreement, to which Agreement the Holder of
this Certificate by virtue of the acceptance hereof assents and by which such
Holder is bound.

            Pursuant to the terms of the Agreement, a distribution will be made
on the 25th day of each month or, if such 25th day is not a Business Day, the
Business Day immediately following (the "Distribution Date"), commencing on the
first Distribution Date specified above, to the Person in whose name this
Certificate is registered at the close of business on the Record Date, in an
amount equal to the product of the Percentage Interest evidenced by this
Certificate and the Group I-A Distribution Amount for the Class I-A-4
Certificates required to be distributed to Holders of the Class I-A-4
Certificates on such Distribution Date, subject to adjustment in certain events
as specified in the Agreement. Distributions in reduction of the Principal
Balance of certain Classes of Class A Certificates may not commence on the first
Distribution Date specified above. Distributions of principal will be allocated
among the Classes of Group I-A Certificates in accordance with the provisions of
the Agreement. The pass-through rate on the Class I-A-4 Certificates applicable
to each Distribution Date will be 6.000% per annum. The amount of interest which
accrues on this Certificate in any month will be subject to reduction with
respect to any Non-Supported Interest Shortfall, any Relief Act Shortfall and
the interest portion of certain Realized Losses allocated to the Class I-A-4
Certificates, as described in the Agreement.

            Distributions on this Certificate will be made by the Paying Agent
by check mailed to the address of the Person entitled thereto, as such name and
address shall appear on the Certificate Register, unless such Person has
notified the Paying Agent pursuant to the Agreement that such payments are to be
made by wire transfer of immediately available funds. Notwithstanding the above,
the final distribution in reduction of the Principal Balance of this Certificate
will be made after due notice of the pendency of such distribution and only upon
presentation and surrender of this Certificate at the office or agency of the
Paying Agent specified for that purpose in the notice of final distribution.

            Reference is hereby made to the further provisions of this
Certificate set forth on the reverse hereof, which further provisions shall for
all purposes have the same effect as if set forth at this place.

            This Certificate constitutes a "regular interest" in a "real estate
mortgage investment conduit" as those terms are defined in Section 860G(a)(1)
and Section 860D, respectively, of the Internal Revenue Code of 1986, as
amended.

            Unless this Certificate has been countersigned by an authorized
officer of the Authenticating Agent, by manual signature, this Certificate shall
not be entitled to any benefit under the Agreement or be valid for any purpose.

<PAGE>

            IN WITNESS WHEREOF, the Paying Agent has caused this Certificate to
be duly executed as of the date set forth below.

Dated:

                                       Wells Fargo Bank, N.A.,
                                            Paying Agent

                                       By
                                         ---------------------------------------
                                            Authorized Officer

Countersigned:

Wells Fargo Bank, N.A.,
  Authenticating Agent

By
   ---------------------------
   Authorized Officer

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