68 lines
2.5 KiB
Markdown
68 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, that via software mixing, thanks to Z80 sound CPU, can play more than one channel of straight-shot samples at once. As of Furnace 0.6pre5, Furnace offers DualPCM, which allows 2 channels of software-mixed 8-bit PCM samples at 13750 Hz.
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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 multiplier.
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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 chip.
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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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