mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-08 22:05:05 +00:00
67 lines
2.6 KiB
Markdown
67 lines
2.6 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, 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.
|
|
|
|
# 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 multiplier.
|
|
- `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.**
|