Exhibit 10.21 FIRST AMENDMENT AND MODIFICATION ACIS-VSI WARRANT AGREEMENT SEPTEMBER 7, 2001 This First Amendment and Modification to ACIS-VSI Warrant Agreement (the "Amendment") amends and modifies that certain ACIS-VSI Warrant Agreement (the...Acis-Vsi Warrant Agreement • April 1st, 2002 • Simtrol Inc • Radio & tv broadcasting & communications equipment
