mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-20 03:25:11 +00:00
67 lines
2.2 KiB
Markdown
67 lines
2.2 KiB
Markdown
# Yamaha YM2612
|
|
|
|
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.
|
|
|
|
# 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 chip.
|
|
- `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.
|
|
- `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:
|
|
- 0: -3
|
|
- 1: -2
|
|
- 2: -1
|
|
- 3: 0
|
|
- 4: 1
|
|
- 5: 2
|
|
- 6: 3
|
|
- 7: -0
|
|
- `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.
|
|
- `5Fxx`: set D2R/SR of operator 4.
|