External Yamaha OPL3 FM music synthesis was retained in the Vibra16S (CT2504), whilst the later (and more common) ViBRA16 chips used CQM (Creative Quadratic Modulation) developed by E-mu Systems.
FM-синтезатор музыки от Yamaha был заменен на CQM (Creative Quadratic Modulation, ), разработанный E-mu Systems.