Document:

EXHIBIT 10.12

                            CHANGE IN TERMS AGREEMENT

<TABLE>
<CAPTION>

----------------- ------------ ---------------- --------------- -------- ------------ ----------- ---------- ---------
   <S>             <C>           <C>               <C>            <C>    <C>           <C>         <C>        <C>
   Principal       Loan Date      Maturity         Loan No.       Call   Collateral    Account     Officer    Initials
  $500,000.00                    02-14-2001        90485255        41        3000       115342       GRA
----------------- ------------ ---------------- --------------- -------- ------------ ----------- ---------- ---------
</TABLE>

References in the shaded area are for Lender's use only and do not limit the
applicability of this document to any particular loan or item.

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Borrower:  CODA MUSIC TECHNOLOGY, INC.    Lender: RIVERSIDE BANK
           6210 BURY DRIVE                        MINNESOTA CENTER OFFICE
           EDEN PRAIRIE, MN 55346                 7760 FRANCE AVENUE SOUTH
                                                  SUITE 125
                                                  BLOOMINGTON, MN 55435

================================================================================

Principal Amount:  $500,000.00            Date of Agreement:  February 14, 2000

DESCRIPTION OF EXISTING INDEBTEDNESS. PROMISSORY NOTE #90485255 DATED FEBRUARY
14, 1997 IN THE ORIGINAL AMOUNT OF $500,000.00. A CHANGE IN TERMS AGREEMENT
DATED FEBRUARY 14, 1998. A CHANGE IN TERMS AGREEMENT DATED FEBRUARY 14, 1999.

DESCRIPTION OF COLLATERAL. ALL CORPORATE ASSETS PER COMMERCIAL SECURITY
AGREEMENT DATED FEBRUARY 14, 1997.

DESCRIPTION OF CHANGE IN TERMS.  TO EXTEND MATURITY DATE.

PROMISE TO PAY. CODA MUSIC TECHNOLOGY, INC. ("Borrower") promises to pay to
RIVERSIDE BANK ("Lender"), or order, in lawful money of the United States of
America, the principal amount of Five Hundred Thousand & 00/100 Dollars
($500,000.00) or so much as may be outstanding, together with interest on the
unpaid outstanding principal balance of each advance. Interest shall be
calculated from the date of each advance until repayment of each advance.

PAYMENT. Borrower will pay this loan in one payment of all outstanding principal
plus all accrued unpaid interest on February 14, 2001. In addition, Borrower
will pay regular monthly payments of accrued unpaid interest beginning March 14,
2000, and all subsequent interest payments are due on the same day of each month
after that. The annual interest rate for this Agreement is computed on a 365/360
basis; that is, by applying the ratio of the annual interest rate over a year of
360 days, multiplied by the outstanding principal balance, multiplied by the
actual number of days the principal balance is outstanding. Borrower will pay
Lender at Lender's address shown above or at such other place as Lender may
designate in writing. Unless otherwise agreed or required by applicable law,
payments will be applied first to accrued unpaid interest, then to principal,
and any remaining amount to any unpaid collection costs and late charges.

VARIABLE INTEREST RATE. The interest rate on this Agreement is subject to change
from time to time based on changes in an independent index which is the PRIME
RATE OF INTEREST AS PUBLISHED EACH BUSINESS DAY IN THE MONEY RATES SECTION OF
THE WALL STREET JOURNAL (the "Index"). The Index is not necessarily the lowest
rate charged by Lender on its loans. If the Index becomes unavailable during the
term of this loan, Lender may designate a substitute Index after notice to
Borrower. Lender will tell Borrower the current Index rate upon Borrower's
request. Borrower understands that Lender may make loans based on other rates as
well. The interest rate change will not occur more often than each DAY. The
Index currently is 8.750% per annum. The interest rate to be applied to the
unpaid principal balance of this Agreement will be at a rate of 1.000 percentage
point over the Index, resulting in an initial rate of 9.750% per annum. NOTICE:
Under no circumstances will the interest rate on this Agreement be more than the
maximum rate allowed by applicable law.

<PAGE>
PREPAYMENT. Borrower agrees that all loan fees and other prepaid finance charges
are earned fully as of the date of the loan and will not be subject to refund
upon early payment (whether voluntary or as a result of default), except as
otherwise required by law. Except for the foregoing, Borrower may pay without
penalty all or a portion of the amount owed earlier than it is due. Early
payments will not, unless agreed to by Lender in writing, relieve Borrower of
Borrower's obligation to continue to make payments of accrued unpaid interest.
Rather, they will reduce the principal balance due.

LATE CHARGE. If a payment is 10 days or more late, Borrower will be charged
5.000% of the unpaid portion of the regularly scheduled payment.

DEFAULT. Borrower will be in default if any of the following happens: (a)
Borrower fails to make any payment when due. (b) Borrower breaks any promise
Borrower has made to Lender, or Borrower falls to comply with or to perform when
due any other term, obligation, covenant, or condition contained in this
Agreement or any agreement related to this Agreement, or in any other agreement
or loan Borrower has with Lender. (c) Any representation or statement made or
furnished to Lender by Borrower or on Borrower's behalf is false or misleading
in any material respect either now or at the time made or furnished. (d)
Borrower becomes insolvent, a receiver is appointed for any part of Borrower's
property, Borrower makes an assignment for the benefit of creditor, or any
proceeding is commenced either by Borrower or against Borrower under any
bankruptcy or insolvency laws. (e) Any creditor tries to take any of Borrower's
property on or in which Lender has a lien or security interest. This includes a
garnishment of any of Borrower's accounts with Lender. (f) Any guarantor dies or
any of the other events described in this default section occurs with respect to
any guarantor of this Agreement. (g) A material adverse change occurs in
Borrower's financial condition, or Lender believes the prospect of payment or
performance of the indebtedness is impaired. (h) Lender in good faith deems
itself insecure.

If any default, other than a default in payment, is curable and if Borrower has
not been given a notice of a breach of the same provision of this Agreement
within the preceding twelve (12) months, it may be cured (and no event of
default will have occurred) if Borrower, after receiving written notice from
Lender demanding cure of such default: (a) cures the default within fifteen (15)
days; or (b) if the cure requires more than fifteen (15) days, immediately
initiates steps which Lender deems in Lender's sole discretion to be sufficient
to cure the default and thereafter continues and completes all reasonable and
necessary steps sufficient to produce compliance as soon as reasonably
practical.

LENDER'S RIGHTS. Upon default, Lender may declare the entire unpaid principal
balance on this Agreement and all accrued unpaid interest immediately due,
without notice, and then Borrower will pay that amount. Lender may hire or pay
someone else to help collect this Agreement if Borrower does not pay. Borrower
also will pay Lender that amount. This includes, subject to any limits under
applicable law, Lender's attorneys' fees and Lender's legal expenses whether or
not there is a lawsuit, including attorneys' fees and legal expenses for
bankruptcy proceedings (including efforts to modify or vacate any automatic stay
or injunction), appeals, and any anticipated post-judgment collection services.
If not prohibited by applicable law, Borrower also will pay any court costs, in
addition to all other sums provided by law. This Agreement has been delivered to
Lender and accepted by Lender in the State of Minnesota. If there is a lawsuit,
Borrower agrees upon Lender's request to submit to the jurisdiction of the
courts of HENNEPIN County, State of Minnesota. This Agreement shall be governed
by and construed in accordance with the laws of the State of Minnesota.

RIGHT OF SETOFF. Borrower grants to Lender a contractual security interest in,
and hereby assigns, conveys, delivers, pledges, and transfers to Lender all
Borrower's right, title and interest in and to, Borrower's accounts with Lender
(whether checking, savings, or some other account), including without limitation
all accounts held jointly with someone else and all accounts Borrower may open
in the future, excluding however all IRA and Keogh accounts, and all trust
accounts for which the grant of a security interest would be prohibited by law.
Borrower authorizes Lender, to the extent permitted by applicable law, to charge
or setoff all sums owing on this Agreement against any and all such accounts.

LINE OF CREDIT. This Agreement evidences a revolving line of credit. Advances
under this Agreement may be requested either orally or in writing by Borrower or

<PAGE>

by an authorized person. Lender may, but need not, require that all oral
requests be confirmed in writing. All communications, instructions, or
directions by telephone or otherwise to Lender are to be directed to Lender's
office shown above. Borrower agrees to be liable for all sums either: (a)
advanced in accordance with the instructions of an authorized person or (b)
credited to any of Borrower's accounts with Lender. The unpaid principal balance
owing on this Agreement at any time may be evidenced by endorsements on this
Agreement or by Lender's internal records, including any daily computer
print-outs. Lender will have no obligation to advance funds under this Agreement
if: (a) Borrower or any guarantor is in default under the terms of this
Agreement or any agreement that Borrower or any guarantor has with Lender,
including any agreement made in connection with the signing of this Agreement;
(b) Borrower or any guarantor ceases doing business or is insolvent; (c) any
guarantor seeks, claims or otherwise attempts to limit, modify or revoke such
guarantor's guarantee of this Agreement or any other loan with Lender; (d)
Borrower has applied funds provided pursuant to this Agreement for purposes
other than those authorized by Lender; or (e) Lender in good faith deems itself
insecure under this Agreement or any other agreement between Lender and
Borrower.

CONTINUING VALIDITY. Except as expressly changed by this Agreement, the terms of
the original obligation or obligations. including all agreements evidenced or
securing the obligation(s), remain unchanged and in full force and effect.
Consent by Lender to this Agreement does not waive Lender's right to strict
performance of the obligation(s) as changed, nor obligate Lender to make any
future change in terms. Nothing in this Agreement will constitute a satisfaction
of the obligation(s). It is the intention of Lender to retain as liable parties
all makers and endorsers of the original obligation(s), including accommodation
parties, unless a party is expressly released by Lender in writing. Any maker or
endorser, including accommodation makers, will not be released by virtue of this
Agreement. If any person who signed the original obligation does not sign this
Agreement below, then all persons signing below acknowledge that this Agreement
is given conditionally, based on the representation to Lender that the
non-signing party consents to the changes and provisions of this Agreement or
otherwise will not be released by it. This waiver applies not only to any
initial extension, modification or release, but also to all such subsequent
actions.

LOAN AGREEMENT. AN EXHIBIT, TITLED "LOAN AGREEMENT" DATED FEBRUARY 14, 1999, IS
ATTACHED TO THIS NOTE AND BY THIS REFERENCE IS MADE A PART OF THIS NOTE JUST AS
IF ALL THE PROVISIONS, TERMS AND CONDITIONS OF THE LOAN AGREEMENT HAD BEEN FULLY
SET FORTH IN THIS NOTE.

MISCELLANEOUS PROVISIONS. Lender may delay or forgo enforcing any of its rights
or remedies under this Agreement without losing them. Borrower and any other
person who signs, guarantees or endorses this Agreement, to the extent allowed
by law, waive presentment, demand for payment, protest and notice of dishonor.
Upon any change in the terms of this Agreement, and unless otherwise expressly
stated in writing, no party who signs this Agreement, whether as maker,
guarantor, accommodation maker or endorser, shall be released from liability.
All such parties agree that Lender may renew or extend (repeatedly and for any
length of time) this loan, or release any party or guarantor or collateral; or
impair, fail to realize upon or perfect Lender's security interest in the
collateral; and take any other action deemed necessary by Lender without the
consent of or notice to anyone. All such parties also agree that Lender may
modify this loan without the consent of or notice to anyone other than the party
with whom the modification is made.

SECTION DISCLOSURE.  This loan is made under Minnesota Statutes, Section 47.59.

<PAGE>

PRIOR TO SIGNING THIS AGREEMENT, BORROWER READ AND UNDERSTOOD ALL THE PROVISIONS
OF THIS AGREEMENT, INCLUDING THE VARIABLE INTEREST RATE PROVISIONS. BORROWER
AGREES TO THE TERMS OF THE AGREEMENT AND ACKNOWLEDGES RECEIPT OF A COMPLETED
COPY OF THE AGREEMENT.

BORROWER:

CODA MUSIC TECHNOLOGY, INC.

By: /s/ John W. Paulson                     By: /s/ Barbara S. Remley
    JOHN W. PAULSON, EXECUTIVE OFFICER          BARBARA REMLEY, CFO

<PAGE>

                     DISBURSEMENT REQUEST AND AUTHORIZATION

<TABLE>
<CAPTION>

----------------- ------------ ---------------- --------------- -------- ------------ ----------- ---------- ---------
  <S>              <C>           <C>               <C>          <C>      <C>          <C>         <C>       <C>
   Principal       Loan Date      Maturity         Loan No.     Call     Collateral   Account     Officer    Initials
  $500,000.00                    02-14-2001        90485255       41        3000       115342       GRA
----------------- ------------ ---------------- --------------- -------- ------------ ----------- ---------- ---------
</TABLE>

References in the shaded area are for Lender's use only and do not limit the
applicability of this document to any particular loan or item.
--------------------------------------------------------------------------------

Borrower:  CODA MUSIC TECHNOLOGY, INC.  Lender: RIVERSIDE BANK
           6210 BURY DRIVE                      MINNESOTA CENTER OFFICE
           EDEN PRAIRIE, MN 55346               7760 FRANCE AVENUE SOUTH
                                                SUITE 125
                                                BLOOMINGTON, MN 55435

================================================================================

LOAN TYPE. This is a Variable Rate (1.000% over PRIME RATE OF INTEREST AS
PUBLISHED EACH BUSINESS DAY IN THE MONEY RATES SECTION OF THE WALL STREET
JOURNAL, making an initial rate of 9.750%), Revolving Line of Credit Loan to a
Corporation for $500,000.00 due on February 14, 2001.

PRIMARY PURPOSE OF LOAN.  The primary purpose of this loan is for:

          [ ]     Maintenance of Borrower's Primary Residence.
          [ ]     Personal, Family or Household Purposes or Personal Investment.
          [ ]     Agricultural Purposes.
          [X]     Business Purposes.

SPECIFIC PURPOSE.  The specific purpose of this loan is: TO EXTEND MATURITY.

DISBURSEMENT INSTRUCTIONS. Borrower understands that no loan proceeds will be
disbursed until all of Lender's conditions for making the loan have been
satisfied. Please disburse the loan proceeds of $500,000.00 as follows:

                  Undisbursed Funds:                          $500,000.00

                  Note Principal:                             $500,000.00

CHARGES PAID IN CASH.  Borrower has paid or will pay in cash as agreed the
following charges:

                  Prepaid Finance Charges Paid in Cash:         $5,000.00
                      $5,000.00 Loan Fees

                  Total Charges Paid in Cash:                   $5,000.00

FINANCIAL CONDITION. BY SIGNING THIS AUTHORIZATION, BORROWER REPRESENTS AND
WARRANTS TO LENDER THAT THE INFORMATION PROVIDED ABOVE IS TRUE AND CORRECT AND
THAT THERE HAS BEEN NO MATERIAL ADVERSE CHANGE IN BORROWER'S FINANCIAL CONDITION
AS DISCLOSED IN BORROWER'S MOST RECENT FINANCIAL STATEMENT TO LENDER. THIS
AUTHORIZATION IS DATED FEBRUARY 14, 2000.

BORROWER:

CODA MUSIC TECHNOLOGY, INC.

By: /s/ John W. Paulson                           By:  /s/ Barbara S. Remley
    JOHN W. PAULSON, EXECUTIVE OFFICER                 BARBARA REMLEY, CFOLEASE EXTENSION AND EXPANSION AGREEMENT

         THIS LEASE EXTENSION AND EXPANSION AGREEMENT, made and entered into
this 19th day of April, 1999, by and between Kraus-Anderson(R), Incorporated, a
Minnesota corporation (hereinafter referred to as "Landlord"), and Datakey,
Inc., a Minnesota corporation ( hereinafter referred to as "Tenant");

         WITNESSETH THAT WHEREAS:

A. Landlord is leasing to Tenant and Tenant is leasing from Landlord certain
premises commonly known as 401-409 West Travelers Trail, Burnsville, Minnesota
and located in Suite 201 through 205 of the Gateway Business Park, Phase II (the
"Complex"), pursuant to written Lease Agreement dated June 3, 1987, as amended
by First Amendment To Lease Agreement dated February 10, 1988, Second Amendment
To Lease Agreement dated December 23, 1988, Amendment No. 3 To Lease Agreement
dated February 13, 1992, Amendment No. 4 To Lease Agreement dated April 1, 1992
and by Lease Amendment No. 5 dated December 17, 1996 (collectively referred to
as the "Lease"); Said premises consist of approximately 11,093 square feet of
office space, approximately 6,000 square feet of technical space and
approximately 1,395 square feet of warehouse space, for a combined area of
approximately 18,488 square feet of floor space as shown crosshatched in blue on
Exhibit A attached hereto (the "Original Leased Premises"); and

B. WHEREAS, Landlord and Tenant desire to amend the Lease to provide that
Tenant's leased space will be increased by approximately an additional 4,589
square feet of office space and approximately an additional 2,295 square feet of
warehouse space, for a combined additional leased area of approximately 6,884
square feet of floor space located in Suite 206 and 207, located adjacent to the
Original Leased Premises, such total of additional leased area being shown
crosshatched in red on Exhibit A attached hereto (the "Expansion Area");

C. WHEREAS, the parties hereto also desires to extend the term of the Lease by a
period of five (5) years and to amend certain other provisions thereof;

         NOW THEREFORE, in consideration of the mutual agreements herein
contained, and for other good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the parties hereby amend the Lease
and agree as follows:

1.       ARTICLE 1, SECTION 2 - PREMISES AND TERM:

         In lieu of Tenant's existing Renewal Option set forth in Paragraph 10
         of Amendment No. 3 To Lease Agreement (the "Renewal Option"), the term
         of the Lease is hereby extended for an additional five (5) year period,
         to commence on July 1, 1999 and to expire on June 30, 2004.

         The Renewal Option is hereby deleted from the Lease as if it had never
         been a part thereof.

2. ARTICLE 1, SECTION 1 - PREMISES:

         Landlord shall continue to lease to Tenant and Tenant shall continue to
         lease from Landlord the Original Leased Premises, in accordance with
         the terms of the Lease. Beginning on July 1, 1999 ("Expansion Date")
         and continuing through the extended Lease expiration date of June 30,
         2004, the Landlord hereby also leases to Tenant and Tenant hereby
         leases from Landlord the Expansion Area. Except as otherwise
         specifically provided in this amendment, Tenant's lease of the Original
         Leased Premises and the Expansion Area, combined, shall be upon the
         same terms and conditions as set forth in the Lease, and from and after
         the Expansion Date of July 1, 1999, the term "Leased Premises" shall be
         defined to mean the Original Leased Premises together with the
         Expansion Area, said combined premises totaling approximately 25,372
         square feet of space.

3.       EARLY OCCUPANCY PERIOD:

         Tenant shall have the right to use and occupy the Expansion Area for
         the period from the date upon which this amendment is fully-executed
         between Landlord and Tenant and continuing until the Expansion Date of
         July 1, 1999 (the "Construction Period") for purposes of adapting the
         premises to Tenant's use under this Lease. Tenant's use and occupancy
         of the Expansion Area during the Construction Period shall be governed
         by all the terms and conditions of this Lease, including, but not
         limited to, the payment by Tenant of all charges for utility services
         furnished to the Expansion Area; provided, however, that Tenant shall
         not owe or pay Landlord any sums for base rent, real estate taxes,
         insurance, or operating costs associated with the Expansion Area during
         said Construction Period.

4. ARTICLE 3 - BASE RENT AND ADDITIONAL RENT:

         a) Additional rents under the Lease for the Expansion Area shall
         commence to be due and payable pursuant to the Lease from and after the
         Expansion Date of July 1, 1999.

         b) Tenant shall continue paying Base Rent for the Original Leased
         Premises at the existing fixed annual Base Rent amount until June 30,
         1999.

         c) Article 3 of the Lease is hereby amended to provide that the fixed
         annual Base Rent for the Original Leased Premises and the Expansion
         Area shall be blended for the combined premises beginning on July 1,
         1999, according to the adjusted schedule of fixed annual Base Rent as
         follows:

          Rental Period:           Annual Base Rent         Monthly Base Rent
          -------------            ----------------         -----------------
          07/01/99 -06/30/2000        $164,918.00                $13,743.17
          07/01/00 -06/30/2001        $171,261.00                $14,271.75
          07/01/01 -06/30/2002        $177,604.00                $14,800.33
          07/01/02 -06/30/2003        $183,947.00                $15,328.92
          07/01/03 -06/30/2004        $190,290.00                $15,857.50

         e) Paragraph 4 of Amendment No. 4 To Lease Agreement is hereby deleted
         in its entirety.

5.       ARTICLE 4, SECTION 4 - OPERATING COST ADJUSTMENT:

         From and after the Expansion Date, "Tenant's Proportionate Share" as
         that phrase is used in the Lease, according to Article 4, Section 4 of
         the Lease, shall be increased from 34.56% to 47.42% from the Expansion
         Date of July 1, 1999 through the extended Lease term, ending on June
         30, 2004.

6.       ADDITIONAL PROVISIONS - LEASEHOLD IMPROVEMENT ALLOWANCE:

         Landlord shall pay to Tenant an allowance ("Improvement Allowance") in
         an amount of One Hundred Sixty One Thousand and No/100 Dollars
         ($161,000.00) upon the following terms and conditions:

         a) The Improvement Allowance shall be applied to the cost of making
         improvements to the Original Leased Premises and Expansion Area in
         preparation for Tenant's lease thereof;

         b) Prior to commencing any construction at the Original Leased Premises
         and the Expansion Area, Tenant shall forward a copy of all construction
         drawings and specifications to the Landlord for the Landlord's prior
         written approval, which shall not be unreasonably withheld or delayed;

         c) All construction shall meet fire and safety standards and all other
         city codes.

         d) Landlord shall not be obligated to pay Tenant any part of the
         Improvement Allowance until such time as Tenant has furnished to
         Landlord signed lien waivers for all work and materials provided in
         connection with said improvements.

7.       ARTICLE 8 - HEATING, VENTILATING AND AIR CONDITIONING SYSTEM REPAIRS:

         a) Landlord shall continue to keep and maintain in good repair the
         heating, ventilating and air conditioning system ("HVAC") serving the
         Original Leased Premises and/or Expansion Area, in accordance with the
         terms of the Lease, as amended hereby. Landlord shall, at all times,
         have access to the HVAC units, and may enter upon the Original Leased
         Premises and/or the Expansion Area for the purpose of repairing and
         maintaining it.

         b) In the event the cost to repair any one particular HVAC unit serving
         the Original Leased Premises and/or the Expansion Area shall exceed 75%
         of the cost to replace such unit, then Landlord, at Landlord's option,
         shall replace said HVAC unit.

         c) Tenant's liability for the cost of replacing any one particular HVAC
         unit as provided herein shall be 50% of the actual cost incurred by
         Landlord.

8.       The expiration date of the term of the Lease, as set forth therein and
         as amended hereby, and all other conditions and covenants of the Lease
         shall apply with full force and effect to Tenant's lease of the
         Expansion Area. From and after the Expansion Date, the Phrase "Leased
         Premises", as used in the Lease, shall be construed to mean the
         Original Leased Premises crosshatched in blue on Exhibit A together
         with the Expansion Area crosshatched in red on Exhibit A, said combined
         premises totaling approximately 25,372 square feet of space.

9.       Except as herein specifically modified and amended, and as previously
         amended on February 10, 1988, December 23, 1988, February 13, 1992,
         April 1, 1992 and on December 17, 1996, the Lease shall remain in full
         force and effect.

         IN WITNESS WHEREOF, the parties hereto have executed this Lease
Extension and Expansion Agreement as of the day and year first above written.

KRAUS-ANDERSON, INCORPORATED             DATAKEY, INC.

By    /s/ Burton F. Dahlberg             By   /s/ Alan Shuler
         Burton F. Dahlberg                   Alan Shuler
   Its   President                          Its  Vice President & CFO
                    LANDLORD                                 TENANT

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