1 EXHIBIT 4.20 AGREEMENT REGARDING CANCELLATION OF WARRANTS This AGREEMENT REGARDING CANCELLATION OF WARRANTS (this "Agreement"), dated as of December 29, 1999, is entered into by and between SPATIALIZER AUDIO LABORATORIES, INC., a Delaware...Agreement Regarding Cancellation of Warrants • March 30th, 2000 • Spatializer Audio Laboratories Inc • Semiconductors & related devices • New York
