Document:

PROMISSORY NOTE

$132,221                                                       December 23, 1999

         FOR VALUE RECEIVED, Angelaudio.com, Inc., a Nevada corporation
("Borrower"), hereby promises to pay to the order of Riz Alikhan, ("Lender"), or
his transferee(s) or assignee(s), on March 1, 2001 (the "Maturity Date"), the
principal sum of one hundred thirty-two thousand two hundred twenty-one dollars
($132,221), together with interest on the unpaid principal balance from December
23, 1999 (the "Loan Date") at the rate of ten percent (10%) per annum, as
provided below (the "Loan").

       1. Payment Terms. Interest on the unpaid principal balance shall accrue
at the annual rate of ten percent (10%). Interest will accrue beginning on the
Loan Date, shall be compounded annually and shall be payable upon maturity. The
outstanding principal balance and any accrued but unpaid interest shall be due
and payable on the Maturity Date. All payments shall be made to Lender at 4268
Rockend Place, West Vancouver, B.C., Canada, or at Lender's then-current
address.

       2. Prepayment. The Loan may be prepaid, in whole or in part, on or before
the maturity date, upon written agreement entered into by Borrower, its
transferee(s) or assignee(s), and Lender, his transferee(s) or assignee(s).

       3. Event of Default. The entire unpaid principal amount of this Note,
together with all accrued but unpaid interest thereon, shall, at the option of
Lender, forthwith become due and payable, without notice or demand of any kind,
all of which are hereby expressly waived, upon the occurrence of any of the
following events:

       a.     the fifth business day after a default in the payment of the
              principal of and interest on the Note in accordance with the terms
              hereof or in the due observance or performance of any of the
              conditions, covenants or agreements contained herein, which has
              not been cured by Borrower;

       b.     if Borrower shall admit in writing its inability to pay its debts
              generally as they become due;

       c.     if Borrower shall be adjudicated bankrupt;

       d.     if bankruptcy, insolvency, arrangement, debt adjustment or
              receivership proceedings, in which Borrower is alleged to be
              insolvent or unable to pay its debts as they mature, shall be
              instituted by or against Borrower, and Borrower shall consent to
              the same or admit in writing the material allegations of the
              petition filed in such proceedings; or if such proceedings shall
              not be dismissed within 30 days after their institution or within
              such additional period of time as Borrower shall reasonably

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              request, provided Borrower is diligently and in good faith
              prosecuting such dismissal; and

       e.     if there is a default under any of the documents creating any
              indebtedness of Borrower and by reason of such default such
              indebtedness is accelerated or Borrower is required to make any
              payments other than those which would have been due in the absence
              of such default.

       4. Remedies. In case any one or more of the events specified in Section 2
hereof shall have occurred and be continuing, Lender may proceed to protect and
enforce his rights either by suit in equity and/or by action at law, whether for
the specific performance of any covenant or agreement contained in this Note or
in aid of the exercise of any power granted in this Note, or Lender may proceed
to enforce the payment of all sums due upon this Note or to enforce any other
legal or equitable right of Lender.

       5. Payment of Costs and Expenses. Borrower shall pay all costs and
expenses (including without limitation, reasonable attorneys' fees) incurred by
Lender in order to collect the amounts due hereunder or to protect his interests
hereunder.

       6. Waiver of Presentment and Notice of Dishonor. Borrower and all others
who may at any time be liable hereon in any capacity, jointly and severally,
waive any requirement of presentment, demand for payment, protest, notice of
dishonor, notice of acceleration, notice of protest, or further notice or demand
of any kind.

       7. Notices. Any consent, approval, notice or demand (individually, and
collectively, a "Notice" or "Notices") which may or are required or permitted to
be given by Borrower or Lender to the other hereunder shall be in writing. All
Notices shall be sent by United States Mail, certified or registered mail,
return receipt requested, or by recognized overnight courier service (such as
Federal Express), or by facsimile or other telecommunication device capable of
transmitting and creating a written record, or personally. Notices are effective
on receipt; provided, any Notice sent by regular mail will be deemed effective
on the third Business Day (as defined in the Loan Agreement) after having been
deposited in any post office or mail depository regularly maintained by the U.S.
Postal Service. Each party shall give notice to the other or its address for
Notices by written Notice to the other. A party may change its address for
Notices by Notice to the other party. Unless a party designates another address
for Notice (by Notice given pursuant to this paragraph), Notices shall be sent
to the following addresses:

Lender:                                           Riz Alikhan
                                             4268 Rockend Place
                                             West Vancouver, B.C., Canada
------------------------------------

Borrower:                                    Angelaudio.com, Inc.
                                             1130 West Pender Street, Suite 1200
                                             Vancouver, B.C., Canada
------------------------------------

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       For the purpose of this instrument, the term "receipt" shall mean the
earlier of any of the following: (i) the date of delivery of the Notice to the
address specified pursuant to this paragraph as shown on the return receipt or
by the records of the courier, (ii) the date of actual receipt of the Notice by
the office of the person or entity specified pursuant to this paragraph, or
(iii) in the case of refusal to accept delivery or inability to deliver the
Notice, the earlier of (A) the date of the attempted delivery or refusal to
accept delivery, (B) the date of the postmark on the return receipt, or (C) the
date of receipt by the sending party of notice that the Notice has been refused
or cannot be delivered. With respect to any notice sent by facsimile or other
telecommunication device, the term "receipt" will mean electronic verification
that transmission to the recipient was completed, if such transmission occurs
during the normal business hours on a Business Day, or otherwise on the next
Business Day after the date of transmission.

       8. Governing Law. This Note shall be governed by and construed in
accordance with the laws of the Province of British Columbia without regard to
the choice of law principles of British Columbia Law.

       9. Binding Effect; Successor and Assigns. This Note shall be binding upon
and inure to the benefit of and be enforceable by the respective successors and
assigns of the parties hereto, provided that Borrower may not sell or assign or
transfer any of its interest hereunder without the prior written consent of
Lender, his transferee(s) or assignee(s).

       10. Severability. If any term, condition, or provision of this Note shall
be held to be invalid, illegal or unenforceable in any respect, then in such
event the remainder of this Note shall not be affected thereby and it shall
remain in full force and effect except with respect to such term, condition, or
provision.

       11. Amendments; No Waiver. The failure of Lender to insist upon the
strict performance of any term, provision or covenant of this Note, or to
exercise any option or election conferred, shall not be deemed to be a waiver or
relinquishment of any future breach of any such term, covenant, condition,
election or option. No provision of this Note may be waived, modified or
discharged orally, by course of dealing or otherwise, without a writing signed
by the party to be charged with such waiver, modification or discharge.

       12. Attorneys' Fees. In case suit or action is instituted to collect this
Note or any portion hereof, the prevailing party shall receive from the losing
party in such suit or action such additional sum as the court may adjudge
reasonable as attorneys' fees and costs in said suit or action, on any appeal
therefrom, and on any petition for review. Further, in the event of default in
any payment, whether or not suit or action is instituted, the undersigned
promises to pay all reasonable costs of collecting such delinquent payment.

       13. Authority of Signatories. Borrower (and the undersigned
representatives or members of Borrower, as applicable) represents that Borrower
has full power, authority and

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<PAGE>

legal right to execute and deliver this Note, and that this Note constitutes a
valid and binding obligation of Borrower.

       14. Liability for Loan. The individual signing on behalf of Borrower is
signing in the capacity indicated below and will not be held personally liable,
in the event of default, to repay the Loan.

             IN WITNESS WHEREOF, Borrower has caused this Note to be executed
and delivered by its agent thereunto duly authorized, as of the date first
written above.

BORROWER:                        ANGELAUDIO.COM, INC., a Nevada corporation

                                 By:  /s/ John Karroll
                                     ------------------------------------
                                 Name:  John Karroll
                                      -----------------------------------
                                 Title:  President
                                       ----------------------------------

                                       4THESE SECURITIES ARE RESTRICTED SECURITIES AS THAT TERM IS DEFINED IN RULE 144
UNDER THE U S. SECURITIES ACT 0F 1933 (THE "ACT"). AS RESTRICTED SECURITIES,
THEY MAY BE RESOLD ONLY IN ACCORDANCE WITH REGULATIONS UNDER THE ACT OR PURSUANT
TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT OR AN EXEMPTION THEREFROM.

THESE SECURITIES HAVE NOT BEEN REGISTERED WITH THE UNITED STATES SECURITIES AND
EXCHANGE COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE. THIS SUBSCRIPTION
AGREEMENT SHALL NOT CONSTITUTE AN OFFER TO SELL NOR A SOLICITATION OF AN OFFER
TO BUY THE SECURITIES IN ANY JURISDICTION IN WHICH SUCH OFFER OR SOLICITATION
WOULD BE UNLAWFUL. THE SECURITIES MAY NOT BE RESOLD OR TRANSFERRED EXCEPT AS
PERMITTED PURSUANT TO REGISTRATION UNDER THE ACT OR EXEMPTION THEREFROM.

THESE SECURITIES HAVE NOT BEEN RECOMMENDED BY ANY FEDERAL OR STATE SECURITIES
COMMISSION OR REGULATORY AUTHORITY. FURTHERMORE, THE FOREGOING AUTHORITIES HAVE
NOT REVIEWED, CONFIRMED OR DETERMINED THE ACCURACY OR ADEQUACY OF THIS DOCUMENT.
ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                             SUBSCRIPTION AGREEMENT

                                                           As of March ___, 2000

This Subscription Agreement (this "Agreement") is being entered into between the
undersigned (the "Subscriber") and CORE SYSTEMS, INC., a Nevada corporation (the
"Company") in connection with the offer and subscription by the Subscriber for
________ units of the Company's securities at a cost of $0.25 per unit (each
unit consists of one share and one warrant exercisable for a period of two years
to acquire one additional share at a price of $0.25). This Agreement
memorializes the transaction agreed to on March ___, 2000, the date on which the
Subscriber paid the Purchase Price (as defined in Section 1) to thc Company. The
price per unit was fixed and all the representations and warranties were made on
that date. The offer and sale of securities was made in reliance upon the
provisions of Regulation S ("Regulation S") under the United States Securities
Act of 1933, as amended (the "Act"). References to "Shares" include shares
issued as part of units and shares issued on the exercise of the warrants
forming part of the units.

1.       Offer to Subscribe; Purchase Price

The Subscriber purchased the securities at a price of U S. Twenty Five Cents
(U.S. $0.25) per unit on March ___, 2000 outside the United States of America
(the "Closing"). Payment was made to the Company's designated account at the
time of the Closing. Thc Company shall deliver a certificate representing the
Shares and Warrants to thc Subscriber within a reasonable time hereafter. The
obligations of each party were subject to the condition that all the

<PAGE>

representations and warranties of the other party contained herein were true at
the time of Closing and all covenants of the other party that were to be
performed by the other party on or before the Closing had been performed.

2. Representations and Warranties of Subscriber; Certain Covenants

2.1 Offshore Transaction. Subscriber represents and warrants to the Company that
(i), Subscriber is not a "U.S. person" as that term is defined in Rule 902(c) of
Regulation S; (ii) at the time of execution of this Agreement. Subscriber was
outside the United States and no offer of the Shares was made to the Subscriber
within the United States; (iii) Subscriber purchased the Shares for its own
account and not on behalf of any U.S. person, and the sale of the Shares had not
been prearranged with any buyer in the United States and (iv) Subscriber is not
a distributor as defined in Regulation S. The Subscriber covenants that all
offers and sales of the Shares prior to the expiration of and period commencing
on the Closing and ending one-year thereafter (the "Restricted Period") shall
not be made to U.S. persons or for the account or benefit of U S. persons and
shall otherwise be made in compliance with the provisions of Regulation S

2.2 Independent Investigation. Subscriber, in electing to subscribe for the
Shares hereunder, relied upon an independent investigation made by it and its
representatives, if any, and had been given access to and the opportunity to
examine all books and records of the Company, and all material contracts and
documents of the Company. The Subscriber has such experience in business and
financial matters that it was capable of evaluating the risk of its investment
and determining the suitability of its investment.

2.3 No Government Recommendation or Approval. Subscriber understands that no
United States federal or state agency has passed upon or made any recommendation
or endorsement of the Company, this transaction or the purchase of the Shares.

2.4 No Registration. Subscriber understands that the Shares have not began
registered under the Act and are being offered and sold pursuant to Regulation S
based in part upon the representations of Subscriber contained herein, and that
the Company is relying on the truth and accuracy of the-Subscriber's
representations and warranties herein to determine whether the offer and sale of
flit Shares is exempt from registration under the Act.

2.5 Investment Intent. Subscriber acquired the Shares to be issued and sold
hereunder for its own account (or a trust account if such Subscriber is a
trustee) and not as a nominee. Subscriber understands that the purchase of the
Shares involves a high degree of risk and that Subscriber must bear the economic
risk of this investment indefinitely unless sale of the Shares is registered
pursuant to the Act, or an exemption from registration for sale thereof is
available Subscriber understands that, in the view of the SEC, the statutory
basis for the exemption claimed for this transaction would not be present if the
offering of the Shares, although in technical compliance with Regulation S, is
part of a plan or scheme to evade the registration provisions of the Act.
Subscriber is acquiring die Shares for investment purposes and has no present
intention to sell the Shares in the United States, to a U.S. Person or for the
account or benefit of a U.S. Person. Subscriber covenants that neither
Subscriber nor its affiliates nor

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<PAGE>

any person acting on its or their behalf has the intention of entering or will
enter during the Restricted Period, into any put option, short position or other
similar instrument or position or any other hedging transactions or arrangements
with respect to the Company's common stock, and neither Subscriber nor any of
its affiliates nor any person acting on its or their behalf will use at any time
Shares acquired pursuant to this Agreement to settle any put option, short
position or other similar instrument or position or any other hedging
transaction or arrangement that may have been entered into prior to the
execution of this Agreement or during the Restricted Period

2.6 No Sale in Violation of the Securities Laws. Subscriber covenants that it
will not knowingly make any sale, transfer or other disposition of the Shares in
violation of the Act, the Securities and Exchange Act of 1934, as amended (the
"Exchange Act") or the rules and regulations of the Securities and Exchange
Commission (the "Commission") promulgated thereunder. All offers and sales of
the Shares will be made pursuant to an effective registration statement under
the Act or an exemption from the registration provisions thereof

2.7 Authority. Subscriber has the full power and authority to execute, deliver
and perform this Agreement. This Agreement, when executed and delivered by
Subscriber, will constitute a legal, valid and binding obligation of Subscriber,
enforceable against the Subscriber in accordance with its terms.

2.8 No Reliance on Tax Advice. Subscriber has reviewed with his, her or its own
tax advisors the foreign U.S. federal, state and local tax consequences of this
investment, where applicable, and the transactions contemplated by this
Agreement. Subscriber is relying solely on such advisors and not on any
statements or representations of the Company or any of its agents with respect
to such tax consequences and understands that Subscriber (and not the Company)
shall be responsible for the Subscriber's own tax liability that may arise as a
result of this investment or the transactions contemplated by this Agreement

2.9 No Legal Advice from Company. Subscriber acknowledges that it has bad the
opportunity to review this Agreement and the transactions contemplated by this
Agreement with its own legal counsel. Subscriber is relying solely on such
counsel and not on any statements or representations of the Company or any of
its agents for legal advice with respect to this investment or the transactions
contemplated by this Agreement except for the representations, warranties and
covenants set forth herein.

3. Resales

Subscriber acknowledges and agrees that the Shares may only be resold in
compliance with Rules 903 or 904 under Regulation S, pursuant to a Registration
Statement under the Act or pursuant to an exemption from registration under the
Act. The Company shall not register any transfer of Shares that is not in
compliance with this Section 3. Subscriber covenants that all offering materials
and documents (other than press releases) used in connection with offers and
sales of the Shares before the expiration of the Restricted Period shall state
that (i) the Shares have not been registered under the Securities Act and may
not be offered or sold in the United States or to a U.S. person (as that term is
defined in Rule 902 of Regulation S) unless they are

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<PAGE>

registered under the Act or an exemption from the registration requirements of
the Act is available and that (ii) hedging transactions involving the Shares may
not be conducted unless in compliance with the Act. These statements shall
appear on the cover or inside cover page and in the underwriting section of any
prospectus or offering circular and shall appear in any advertisement used in
connection with the offer or sale of the Shares.

4. Legends; Subsequent Transfer of Shares

The certificates representing the Shares shall bear the legend set forth in the
first paragraph on tie first page of this Agreement and any other legend, if
such legend or legends are reasonably required by the Company to comply with
state, federal or foreign law.

5. Representations, Warranties and Covenants of the Company

5.1 Organization and Good Standing. The Company is a corporation duly organized,
validly existing and in good standing under the laws of the State of Nevada and
has all requisite corporate power and authority to carry on its business as now
conducted and as proposed to be conducted.

5.2 Authorization. All corporate action on the part of the Company, its
officers, directors and shareholders necessary for the authorization, execution
and delivery of this Agreement, the performance of all obligations of the
Company hereunder and the authorization, issuance and delivery of the Shares
have been taken, and this Agreement constitutes a legal, valid and binding
obligation of the Company, enforceable against the Company in accordance with
its terms.

5.3 Valid Issuance of Shares. The Shares, when issued, sold and delivered in
accordance with the terms hereof for the Purchase Price will be duly and validly
issued and outstanding, fully paid and nonassessable, and based in part on the
representations and warranties of Subscriber will be issued in compliance with
all applicable federal, state and other applicable securities laws

6. Governing Laws

This Agreement shall be governed by and construed in accordance with the laws of
the State of Nevada, except for matters arising under the Act or the Securities
Exchange Act of 1934 which matters shall be construed and interpreted in
accordance with such laws.

7. Entire Agreement; Amendment

This Agreement constitutes the full and entire understanding and agreement
between the parties with regard to the subjects hereof and thereof, and no party
shall be liable or bound to any other party in any manner by any warranties,
representations or covenants except as specifically set forth herein or therein.
Except as expressly provided herein, neither this Agreement nor any term hereof
may be amended, waived, discharged or terminated other than by a written
instrument signed by the party against whom enforcement of any such amendment,
waiver, discharge or termination is sought.

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<PAGE>

8. Notices

Any notice, deemed or request required or permitted to be given by either the
Company or the Subscriber pursuant to the terms of this Agreement shall be in
writing and shall be deemed given when delivered personally or by facsimile,
with a hard copy to follow by two day courier addressed to the parties at the
addresses of the parties set forth at the end of this Agreement or such other
address as a party may request by notifying the other in writing.

9.       Counterparts

This Agreement may be executed in any number of counterparts, each of which
shall be enforceable against the parties actually executing such counterparts,
and all of which together shall constitute one instrument.

10.      Severability

In the event that any provision of this Agreement becomes or is declared by a
court of competent jurisdiction to be illegal, unenforceable or void, this
Agreement shall continue in full force and effect without said provision,
provided that no such severability shall be effective if it materially changes
the economics benefit of this Agreement to any party.

11.      Titles and Subtitles

The tiles and subtitles used in this Agreement are used for convenience only and
are not to be considered in construing or interpreting this Agreement.

WHEREAS the undersigned has caused this Agreement to be executed as of the date
first written above.

                                          AKBAR ALIKHAN
                                          --------------------------------------
                                          [print name]

                                          --------------------------------------
                                          Authorized Signatory

                                          FL BLOCK IV, CLIFTON
                                          --------------------------------------
                                          Address

                                          KARACHI, PAKISTAN
                                          --------------------------------------

AGREED TO AND ACCEPTED:
CORE SYSTEMS, INC.

By:
         -------------------------------
         Authorized Signatory

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