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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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For 0.6pre1, Furnace can now support advanced YM2612 features that [Fractal ](https://gitlab.com/Natsumi/Fractal-Sound ) sound driver adds: two software-mixed PCM channels (variable pitch, sample offsets, max 13.7 khz rate) and CSM - ch3 special mode feature that can be abused to produce rudimentary speech synthesis.
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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.
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- only in extended channel 3 chip.
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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.
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- `30xx` : enable envelope hard reset.
- this works by inserting a quick release and tiny delay before a new note.
- `50xy` : set AM of operator.
- `x` is the operator (1-4). a value of 0 means "all operators".
- `y` determines whether AM is on.
- `51xy` set SL of operator.
- `x` is the operator (1-4). a value of 0 means "all operators".
- `y` is the value.
- `52xy` set RR of operator.
- `x` is the operator (1-4). a value of 0 means "all operators".
- `y` is the value.
- `53xy` set DT of operator.
- `x` is the operator (1-4). a value of 0 means "all operators".
- `y` is the value:
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- 0: -3
- 1: -2
- 2: -1
- 3: 0
- 4: 1
- 5: 2
- 6: 3
- 7: -0
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- `54xy` set RS of operator.
- `x` is the operator (1-4). a value of 0 means "all operators".
- `y` is the value.
- `55xy` set SSG-EG of operator.
- `x` is the operator (1-4). a value of 0 means "all operators".
- `y` is the value (0-8).
- values between 0 and 7 set SSG-EG.
- value 8 disables it.
- `56xx` : set DR of all operators.
- `57xx` : set DR of operator 1.
- `58xx` : set DR of operator 2.
- `59xx` : set DR of operator 3.
- `5Axx` : set DR of operator 4.
- `5Bxx` : set D2R/SR of all operators.
- `5Cxx` : set D2R/SR of operator 1.
- `5Dxx` : set D2R/SR of operator 2.
- `5Exx` : set D2R/SR of operator 3.
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- `5Fxx` : set D2R/SR of operator 4.
