/  <  Computer  <  Platform  <  PC, IBM compatible  <  Sound and Music  <  Creative Labs  <  Sound Blaster  <  ESS AudioDrive (compatible)  <  ESFM  <  US Patent 5,581,045 METHOD AND INTEGRATED CIRCUIT FOR THE FLEXIBLE COMBINATION OF FOUR OPERATORS IN SOUND SYNTHESIS by ESS Technology (1996-12-03).pdf