YM2164, aka OPP (FM Operator Type-P), is an FM synthesis sound chip developed by Yamaha, related to Yamaha's YM2151. It was used in various MIDI-based synthesizers, including the Yamaha DX21, DX27, DX100, SFG-05 and FB-01, along with the Korg DS-8 and 707. It also served as the synthesizer component of the IBM Music Feature Card.
The YM2164 has the following features:
Compared to the YM2151, it's 8th channel lacks it's 4th operator noise generation ability, has improved stereo-panning capabilities, and includes multitimbral support.
While it was available for use by Korg, the chips were unavailable for purchase outside of Yamaha.
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