Document:

<PAGE>

                                                                  Exhibit 10(ff)

                             AMENDMENT TO AGREEMENT
                              OF PURCHASE AND SALE

     THIS AMENDMENT (this "Amendment"), dated as of April 13, 2000, is by and
                           ---------
among TeleManagement Services, Inc. (the "Company"), Lee H. Edelstein (the
"Shareholder") and TLM Holdings Corp. (the "Purchaser").

                                   WITNESSETH

     WHEREAS, the Purchaser, the Shareholder and the Company have entered into
that certain Agreement of Purchase and Sale dated as of January 1, 1997 (the
"Purchase Agreement"); and

     WHEREAS, the Company was voluntarily dissolved on December 9, 1997, and the
Shareholder, as sole director at the time, is empowered to execute this
Amendment as Trustee of the dissolved corporation; and

     WHEREAS, the parties hereto desire to amend the Purchase Agreement.

     NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged by each of the Purchaser, the
Shareholder and the Company, the Purchase Agreement is hereby amended as
follows:

                                  DEFINITIONS

     Definitions.  Unless otherwise defined herein, capitalized terms used in
     -----------
this Amendment have the meanings provided in the Purchase Agreement.

                                   AMENDMENTS

     1.  Amendment to Section I(D).  Section I(D) of the Purchase Agreement is
         -------------------------
amended and restated in its entirety to read as follows:

     D.  Contingent Payments.    Subject to the conditions set forth herein and
         -------------------
     in Schedule IV hereto, within ninety (90) days after December 31, 1997, and
     December 31, 1998, and within one hundred fifty (150) days after December
     31, 1999, the Purchaser shall deliver to the Company the Contingent
     Payments, if any, payable with respect to the twelve-month periods ending
     December 31, 1997, December 31, 1998, and December 31, 1999, respectively.
     The amount of the Contingent Payments payable to the Company  with respect
     to each such twelve-month period (each, a "Contingent Period") shall be
     calculated based upon the earnings before interest, taxes and amortization
     ("EBITA") achieved by the Contingent Payment Business (as hereinafter
     defined) during such Contingent Period.  Each of the Contingent Payments,
     if any, shall be made by delivery to the Company of (i) a certified or
     official bank check payable to the order of the Company and (ii) a
     certificate representing shares of common stock, $.01 par value ("Purchaser
<PAGE>

                                                                  Exhibit 10(ff)

     Common Stock"), of the Purchaser, registered in the name of the Company, in
     each case, in such amounts of cash and in such numbers of shares as are
     determined in accordance with Schedule IV hereto.  Notwithstanding the
     foregoing or any other provisions of this Agreement (including, without
     limitation, Schedule IV hereto), the Contingent Payment due with respect to
     the twelve-month period ending December 31, 1999:  (a) shall not exceed a
     total of $1.2 million; and (b) shall be paid one-half in the common stock
     of the Purchaser and one-half in cash.

     2.  Amendment to Schedule IV(3).  Section (3) of Schedule IV of the
         ---------------------------
Purchase Agreement is amended and restated in its entirety to read as follows:

     (3)  For the Contingent Period Ending December 31, 1999 the Company shall
          --------------------------------------------------------------------
          receive Contingent Payments equal to:
          ------------------------------------

     The EBITA of the Contingent Payment Business for such Contingent Period
          multiplied by 1.8333 minus the Subtrahend; provided that, in no event,
                                                     --------
          shall the Contingent Payment for such Contingent Period exceed a total
          of $1.2 million.

     3.  Amendment to Payments section of Schedule IV.  The Payments section of
         --------------------------------------------       --------
Schedule IV is amended and restated in its entirety to read as follows:

                                    Payments
                                    --------

     The Contingent Payments will be payable 50% in cash and 50% in shares of
     the Purchaser Common Stock (valued at the lesser of $15.00 per share or the
     Market Price per share (as hereinafter defined) of the Purchaser Common
     Stock).  The term "Market Price" shall mean the average for the sixty days
     ending five business days prior to the date each Contingent Payment is due
     (ninety days after the last day of the prior calendar year) of the last
     sale price regular way, or, in case no sale takes place on any such day,
     the average of the closing bid and asked prices regular way, in either case
     on the principal national securities exchange on which the Purchaser Common
     Stock is listed or admitted to trading, or if the Purchaser Common Stock is
     not listed or admitted to trading on any national securities exchange, the
     last sale price reported on the National Market System of the National
     Association of Securities Dealers Automated Quotation System ("NASDAQ"), or
     the last sale price in the over-the-counter market reported on NASDAQ,
     whichever is applicable, or if there are no such prices reported on NASDAQ,
     as furnished to the Purchaser by any New York Stock Exchange member
     selected from time to time by the Purchaser for such purposes.  If the
     Purchaser Common Stock is not traded on a stock exchange or in the over-
     the-counter market, the Market Price shall be the value of the Purchaser
     Common Stock determined by a New York Stock Exchange member selected by the
     Purchaser and approved by the Company; it being understood that Lehman
     Brothers, Inc., J.P. Morgan & Co., Inc., and Smith Barney Inc., shall be
     deemed to have been approved by the Company to determine the Market Price
     if the Purchaser Common Stock is not traded on a stock exchange or in the
     over-the-counter market.  In the event a Reorganization shall have
     occurred, the "Market Price" per share

                                       2
<PAGE>
                                                                  Exhibit 10(ff)

     shall be the value of the Reorganization Consideration per share, with any
     securities included in the Reorganization Consideration valued as set forth
     above and the value of any other non-cash consideration determined in
     accordance with the immediately preceding sentence.

                                 MISCELLANEOUS

     1.  Condition Precedent.  The execution of this Amendment is a condition
         -------------------
precedent to the effectiveness of that certain Amendment Agreement and Waiver to
be executed in connection with that certain Credit Agreement among Access
Worldwide Communications, Inc. (the "Borrower"), certain subsidiaries of the
Borrower, including the Purchaser and the Company, Bank of America, N.A., as
agent, and the lenders party thereto dated as of March 12, 1999.

     2.  Representations and Warranties of the Purchaser and the Company.  Each
         ---------------------------------------------------------------
of the Purchaser and the Company  hereby represents and warrants that each:  (i)
has the requisite corporate power and authority to execute, deliver and perform
this Amendment, as applicable; and (ii) is duly authorized to, and has been
authorized by all necessary corporate action, to execute, deliver and perform
this Amendment, and this Amendment does not violate any law, rule, regulation,
contract or agreement otherwise enforceable by or against either of the
Purchaser or the Company.

3.   Representations of the Shareholder.  The Shareholder hereby represents and
     ----------------------------------
     warrants that he:  (i) has had the opportunity to obtain the assistance of
     legal counsel in carefully reviewing, discussing and considering all terms
     of this Amendment;  (ii) executes this Amendment as a free and voluntary
     act, without any duress, coercion or undue influence exerted by or on
     behalf of any other party;  and (iii) has full and complete authorization
     and power to execute this Amendment in the capacities herein stated, and
     this Amendment does not violate any law, rule, regulation, contract or
     agreement otherwise enforceable by or against him.

  4.                  Limited Modification.  Except as specifically amended
                      --------------------
hereby, the Purchase Agreement shall remain in full force and effect in
accordance with its terms.

5.   No Oral Agreements.  This Amendment may not be contradicted by evidence of
     ------------------
     prior, contemporaneous or subsequent oral agreements among the parties.
     There are no unwritten agreements among the Purchaser, the Company and the
     Shareholder.

6.   Counterparts.  This Amendment may be executed by the parties hereto in
     ------------
     several counterparts (including facsimile counterparts), each of which
     shall be deemed to be an original and all of which shall constitute
     together but one and the same agreement.  Delivery of an executed
     counterpart of this Amendment by telecopy shall be effective as an original
     and shall constitute a representation that an original shall be delivered.

7.   Governing Law.  THIS AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE
     -------------
     PARTIES HEREUNDER SHALL BE GOVERNED BY AND

                                       3
<PAGE>
                                                                  Exhibit 10(ff)

     CONSTRUED AND INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE STATE OF
     FLORIDA.

  8. Successors and Assigns.  This Amendment shall be binding
     ----------------------
upon and inure to the benefit of the parties hereto and their respective
successors and assigns.

  IN WITNESS WHEREOF, TLM Holding Corp., TeleManagement Services, Inc. and Lee
H. Edelstein have caused this Amendment to be duly executed on the date first
above written.

                              TLM HOLDINGS, CORP.

                              By:_______________________________
                              Name:
                              Title:

                              TELEMANAGEMENT SERVICES, INC.

                              By:_______________________________
                              Name:
                              Title:

   ________________    (SEAL)
  Witness                          Lee H. Edelstein

                                       4<PAGE>

                                                                     Exhibit 4.1

                     PARADIGM ADVANCED TECHNOLOGIES, INC.
                            SUBSCRIPTION AGREEMENT

Paradigm Advanced Technologies, Inc.
1 Concorde Gate
Suite 201
Toronto, Ontario M2C 3N6
Canada

Ann.:  Mr. David Kerzner, President

Gentlemen:
          1.   Application.  The undersigned, intending to be legally bound,
hereby subscribes for        shares (the "Shares") of Common Stock (the "Common
Stock") of Paradigm Advanced Technologies, Inc., a Delaware corporation (the
"Company"), at a purchase price of $      (        ) per Share. In addition
to the shares the undersigned shall also receive warrants to purchase 1 common
share of Common Stock of the Company for every share acquired in terms of this
Agreement at a purchase price of $       (        ) per Share. These
warrants shall terminate on         ,     .

          2.   Representations and Warranties of the Subscriber.  The
undersigned represents and warrants to the Company as follows:

               (a)  The undersigned, in making the decision to purchase the
     Shares subscribed for, has relied upon independent investigations made by
     him and his representatives, if any, and the undersigned and/or his
     advisors have had a reasonable opportunity to ask questions of and receive
     answers from the Company concerning the Shares.

               (b)  The undersigned has been supplied with or has sufficient
     access to all information, including financial statements and other
     financial information of the Company, and has been afforded an opportunity
     to ask questions of and receive answers from an officer of the Company
     concerning information to which a reasonable investor would attach
     significance in making investment decisions, so that as a reasonable
     investor the undersigned has been able to make the undersigned's decision
     to purchase the Shares.

               (c)  The undersigned is not subscribing for the Shares as a
     result of or subsequent to any advertisement article, notice or other
     communication published in any newspaper, magazine or similar media or
     broadcast over television or radio, or presented at any seminar or meeting,
     or any solicitation of a subscription by a person not previously known to
     the undersigned in connection with investments in securities generally.

               (d)  The undersigned is able to bear the substantial economic
     risks of an investment in the Shares for an indefinite period of time, has
     no need for liquidity in such
<PAGE>

     investment, has made commitments to investments that are not readily
     marketable which are reasonable in relation to the undersigned's net worth
     and, at the present time, could afford a complete loss of such investment.

               (e)  The undersigned has such knowledge and experience in
     financial, tax and business matters so as to enable the undersigned to
     utilize the information made available to the undersigned in connection
     with the offering of the Shares to evaluate the merits and risks of an
     investment in the Shares and to make an informed investment decision with
     respect thereto.

               (f)  The undersigned acknowledges that the purchase of the Shares
     involves a high degree of risk and further acknowledges that he can bear
     the economic risk of the purchase of the Shares, including the total loss
     of his investment. The undersigned is not relying on the Company with
     respect to the tax and other economic considerations of an investment in
     the Shares, and the undersigned has relied on the advice of, or has
     consulted with, only the undersigned's own advisor(s).

               (g)  The undersigned has full right and power to perform pursuant
     to this Subscription Agreement and make an investment in the Company.

               (h)  The undersigned will not sell or otherwise transfer the
     Shares without registration under the Securities Act of 1933, as amended
     (the "Securities Act"), or an exemption therefrom and fully understands
     that the Shares have not been registered under the Securities Act or under
     the certain state securities laws and, therefore, cannot be resold,
     pledged, assigned or otherwise disposed of unless the securities are
     subsequently registered under the Securities Act and under the applicable
     state securities laws unless an exemption from such registration is
     available in the opinion of counsel for the holder, which counsel and
     opinion are reasonably satisfactory to counsel for the Company. The
     undersigned is purchasing the Shares for the undersigned's own account, for
     investment purposes only and not with a view to resale or distribution
     except in compliance with the Securities Act. The undersigned is aware that
     an exemption from the registration requirements of the Securities Act
     pursuant to Rule 144 promulgated thereunder is not presently available;
     that the Company has no obligation to make available an exemption from the
     registration requirements pursuant to such Rule 144; and that even if an
     exemption under Rule 144 were available, Rule 144 permits only routine
     sales of securities in limited amounts in accordance with the terms and
     conditions of such Rule 144.

               (i)  The undersigned agrees to the placement of a legend on the
     Shares and on any certificate or other document evidencing the Shares
     stating that they have not been registered under the Securities Act (and a
     stop transfer order may be placed with respect thereto).

               (j)  The undersigned understands that the Shares is being offered
     and sold to him in reliance on specific exemptions from the registration
     requirements of federal and state securities laws and that the Company is
     relying upon the truth and accuracy of the representations, warranties,
     agreements, acknowledgments and understandings of the

                                      -2-
<PAGE>

     undersigned set forth herein in order to determine the applicability of
     such exemptions and the suitability of the undersigned to acquire the
     Shares. The representations, warranties and agreements contained herein are
     true and correct as of the date hereof and may be relied upon by the
     Company, and the undersigned will notify the Company immediately of any
     adverse change in any such representations and warranties which may occur
     prior to the acceptance of the subscription and will promptly send the
     Company written confirmation thereof. The representations, warranties and
     agreements of the undersigned contained herein shall survive the execution
     and delivery of this Subscription Agreement and the purchase of the Shares.

          3. Accredited Investor Status. The undersigned further represents and
warrants as indicated below by the undersigned's initials:

                    (a) ____ I certify that I am an accredited investor because
          I have had individual income (exclusive of any income earned by my
          spouse) of more than $200,000 in each of the most recent two years and
          I reasonably expect to have an individual income in excess of $200,000
          for the current year.

                    (b) ____ I certify that I am an accredited investor because
          I have had joint income with my spouse in excess of $300,000 in each
          of the two most recent years and I reasonably expect to have joint
          income with my spouse in excess of $300,000 for the current year.

                    (c) ____ I certify that I am an accredited investor because
          I have an individual net worth, or my spouse and I have a joint net
          worth, in excess of $1,000,000.

          4. Miscellaneous.

               (a) This Subscription Agreement shall survive the death or
     disability of the undersigned and shall be binding upon the undersigned's
     heirs, executors, administrators, successors and permitted assigns.

               (b) This Subscription Agreement has been duly and validly
     authorized, executed and delivered by the undersigned and constitutes the
     valid, binding and enforceable agreement of the undersigned. If this
     Subscription Agreement is being completed on behalf of a corporation,
     partnership or trust, it has been completed and executed by an authorized
     corporate officer, general partner or trustee.

               (c) This Subscription Agreement and the documents referred to
     herein constitute the entire agreement between the parties hereto with
     respect to the subject matter hereof and together supersede all prior
     discussions or agreements in respect thereof.

               (d) Within five (5) days after receipt of a written request from
     the Company, the undersigned agrees to provide such information, to execute
     and deliver such documents and to take, or forbear from taking, such
     actions or provide such further

                                      -3-
<PAGE>

     assurances as reasonably may be necessary to correct any errors in
     documentation, to comply with any and all laws to which the Company is
     subject.

               (e) The Company shall be notified immediately of any change in
     any of the information contained above occurring prior to the undersigned's
     purchase of the Shares or at any time thereafter for so long as the
     undersigned is a holder of the Shares.

               (f) This Subscription Agreement may be executed in two or more
     counterparts, each of which shall be deemed to be an original, but all of
     which shall constitute a single document.

                           [signature page follows]

                                      -4-
<PAGE>

          IN WITNESS WHEREOF, the undersigned has executed this Revised
Subscription Agreement as of     day of         , 2000.

                                          -----------------------------------
                                          Name

                                          Social Security
                                          or Taxpayer
                                          Identification No.
                                                            -----------------

                                          U.S. Citizen
                                              Yes     No
                                          ---     ---

                                          Business Address:

                                          -----------------------------------
                                          Street

                                          -----------------------------------
                                          City        State      Zip Code

                                          Mailing Address (if different
                                          from Residence or Business
                                          Address):

                                          -----------------------------------
                                          Street

                                          -----------------------------------
                                          City        State      Zip Code

ACCEPTED AND AGREED TO:

PARADIGM ADVANCED TECHNOLOGIES, INC.

By:
   ----------------------
Name:
     --------------------
Title:
      -------------------
Date:
     ---------------,2000

                                      -5-

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