 The 8-bit versions used different DAC and ADC parts for playback and recording and used dual AdLib-compatible Yamaha OPL2 FM music synthesizers to create stereo sound.To provide true compatibility with the Sound Blaster's 8-bit playback on its 8-bit "Pro AudioSpectrum Plus" and 16-bit "Pro AudioSpectrum 16", Media Vision included the same sound processor chip it used on its Thunder Board card.Thus, there were actually two digital audio playback devices on these cards that could also be used at the same time.