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Avril 14th YM2151

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Aphex Twin’s Avril 14th from a YM2151 chip

The YM2151, aka OPM (FM Operator Type-M) is an eight-channel four-operator sound chip. It was Yamaha’s first single-chip FM synthesis implementation, created originally for the Yamaha DX series of keyboards.

A Tuesday night learning FM Synthesis and the workings of the YM2151 chip.