furnace/papers/doc/7-systems/ym2612.md

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# Yamaha YM2612
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one of two chips that powered the Sega Genesis. It is a six-channel, four-operator FM synthesizer. Channel #6 can be turned into 8-bit PCM player.
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# effects
- `10xy`: set LFO parameters.
- `x` toggles the LFO.
- `y` sets its speed.
- `11xx`: set feedback of channel.
- `12xx`: set operator 1 level.
- `13xx`: set operator 2 level.
- `14xx`: set operator 3 level.
- `15xx`: set operator 4 level.
- `16xy`: set multiplier of operator.
- `x` is the operator (1-4).
- `y` is the mutliplier.
- `17xx`: enable PCM channel.
- this only works on channel 6.
- `18xx`: toggle extended channel 3 mode.
- 0 disables it and 1 enables it.
- only in extended channel 3 system.
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- `19xx`: set attack of all operators.
- `1Axx`: set attack of operator 1.
- `1Bxx`: set attack of operator 2.
- `1Cxx`: set attack of operator 3.
- `1Dxx`: set attack of operator 4.