4d7c1c9e44
* docs update mentions of fractal, new chips documentation, and other minor stuff * add a link to the Fractal repo as suggested by @breakthetargets * better wording, less typos
70 lines
2.5 KiB
Markdown
70 lines
2.5 KiB
Markdown
# 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
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- `10xy`: set LFO parameters.
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- `x` toggles the LFO.
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- `y` sets its speed.
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- `11xx`: set feedback of channel.
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- `12xx`: set operator 1 level.
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- `13xx`: set operator 2 level.
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- `14xx`: set operator 3 level.
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- `15xx`: set operator 4 level.
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- `16xy`: set multiplier of operator.
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- `x` is the operator (1-4).
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- `y` is the mutliplier.
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- `17xx`: enable PCM channel.
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- this only works on channel 6.
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- `18xx`: toggle extended channel 3 mode.
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- 0 disables it and 1 enables it.
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- only in extended channel 3 system.
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- `19xx`: set attack of all operators.
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- `1Axx`: set attack of operator 1.
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- `1Bxx`: set attack of operator 2.
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- `1Cxx`: set attack of operator 3.
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- `1Dxx`: set attack of operator 4.
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- `30xx`: enable envelope hard reset.
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- this works by inserting a quick release and tiny delay before a new note.
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- `50xy`: set AM of operator.
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- `x` is the operator (1-4). a value of 0 means "all operators".
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- `y` determines whether AM is on.
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- `51xy` set SL of operator.
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- `x` is the operator (1-4). a value of 0 means "all operators".
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- `y` is the value.
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- `52xy` set RR of operator.
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- `x` is the operator (1-4). a value of 0 means "all operators".
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- `y` is the value.
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- `53xy` set DT of operator.
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- `x` is the operator (1-4). a value of 0 means "all operators".
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- `y` is the value:
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- 0: -3
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- 1: -2
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- 2: -1
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- 3: 0
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- 4: 1
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- 5: 2
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- 6: 3
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- 7: -0
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- `54xy` set RS of operator.
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- `x` is the operator (1-4). a value of 0 means "all operators".
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- `y` is the value.
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- `55xy` set SSG-EG of operator.
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- `x` is the operator (1-4). a value of 0 means "all operators".
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- `y` is the value (0-8).
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- values between 0 and 7 set SSG-EG.
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- value 8 disables it.
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- `56xx`: set DR of all operators.
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- `57xx`: set DR of operator 1.
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- `58xx`: set DR of operator 2.
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- `59xx`: set DR of operator 3.
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- `5Axx`: set DR of operator 4.
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- `5Bxx`: set D2R/SR of all operators.
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- `5Cxx`: set D2R/SR of operator 1.
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- `5Dxx`: set D2R/SR of operator 2.
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- `5Exx`: set D2R/SR of operator 3.
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- `5Fxx`: set D2R/SR of operator 4.
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