mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-18 10:35:11 +00:00
115 lines
4.6 KiB
Markdown
115 lines
4.6 KiB
Markdown
# Yamaha OPZ (YM2414)
|
|
|
|
**disclaimer: despite the name, this has nothing to do with teenage engineering's OP-Z synth!**
|
|
|
|
this is the YM2151's little-known successor, used in the Yamaha TX81Z and a few other Yamaha synthesizers. oh, and the Korg Z3 too.
|
|
|
|
it adds these features on top of the YM2151:
|
|
- 8 waveforms (but they're different from the OPL ones)
|
|
- per-channel (possibly) linear volume control separate from TL
|
|
- increased multiplier precision (in 1/16ths)
|
|
- 4-step envelope generator shift (minimum TL)
|
|
- another LFO
|
|
- no per-operator key on/off
|
|
- fixed frequency mode per operator (kind of like OPN family's extended channel mode but with a bit less precision and for all 8 channels)
|
|
- "reverb" effect (actually extends release)
|
|
|
|
unlike the YM2151, this chip is officially undocumented. very few efforts have been made to study the chip and document it...
|
|
therefore emulation of this chip in Furnace is incomplete and uncertain.
|
|
|
|
no plans have been made for TX81Z MIDI passthrough, because:
|
|
- Furnace works with register writes rather than MIDI commands
|
|
- the MIDI protocol is slow (would not be enough).
|
|
- the TX81Z is very slow to process a note on/off or parameter change event.
|
|
- the TL range has been reduced to 0-99, but the chip goes from 0-127.
|
|
|
|
# effects
|
|
|
|
- **`10xx`**: set noise frequency of channel 8 operator 4. 00 disables noise while 01 to 20 enables it.
|
|
- **`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`**: set LFO speed.
|
|
- **`18xx`**: set LFO waveform. `xx` may be one of the following:
|
|
- `00`: saw
|
|
- `01`: square
|
|
- `02`: triangle
|
|
- `03`: noise
|
|
- **`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.
|
|
- **`1Exx`**: set LFO AM depth.
|
|
- **`1Fxx`**: set LFO PM depth.
|
|
- **`24xx`**: set LFO 2 speed.
|
|
- **`25xx`**: set LFO 2 waveform. `xx` may be one of the following:
|
|
- `00`: saw
|
|
- `01`: square
|
|
- `02`: triangle
|
|
- `03`: noise
|
|
- **`26xx`**: set LFO 2 AM depth.
|
|
- **`27xx`**: set LFO 2 PM depth.
|
|
- **`28xy`**: set reverb of operator.
|
|
- `x` is the operator (1-4). a value of 0 means "all operators".
|
|
- `y` is the value.
|
|
- **`2Axy`**: set waveform of operator.
|
|
- `x` is the operator (1-4). a value of 0 means "all operators".
|
|
- `y` is the value.
|
|
- **`2Bxy`**: set EG shift of operator.
|
|
- `x` is the operator (1-4). a value of 0 means "all operators".
|
|
- `y` is the value.
|
|
- **`2Cxy`**: set fine multiplier of operator.
|
|
- `x` is the operator (1-4). a value of 0 means "all operators".
|
|
- `y` is the value.
|
|
- **`2Fxx`**: enable envelope hard reset.
|
|
- this works by inserting a quick release and tiny delay before a new note.
|
|
- **`3xyy`**: set fixed frequency of operator 1/2.
|
|
- `x` is the block (0-7 for operator 1; 8-F for operator 2).
|
|
- `y` is the frequency. fixed frequency mode will be disabled if this is less than 8.
|
|
- the actual frequency is: `y*(2^x)`.
|
|
- **`4xyy`**: set fixed frequency of operator 3/4.
|
|
- `x` is the block (0-7 for operator 3; 8-F for operator 4).
|
|
- `y` is the frequency. fixed frequency mode will be disabled if this is less than 8.
|
|
- the actual frequency is: `y*(2^x)`.
|
|
- **`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: +0
|
|
- 1: +1
|
|
- 2: +2
|
|
- 3: +3
|
|
- 4: -0
|
|
- 5: -3
|
|
- 6: -2
|
|
- 7: -1
|
|
- **`54xy`**: set RS of operator.
|
|
- `x` is the operator (1-4). a value of 0 means "all operators".
|
|
- `y` is the value.
|
|
- **`55xy`**: set DT2 of operator.
|
|
- `x` is the operator (1-4). a value of 0 means "all operators".
|
|
- `y` is the value.
|
|
- **`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.
|