106 lines
4.1 KiB
Markdown
106 lines
4.1 KiB
Markdown
# Yamaha OPZ (YM2414)
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**disclaimer: despite the name, this has nothing to do with teenage engineering's OP-Z synth!**
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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.
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it adds these features on top of the YM2151:
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- 8 waveforms (but they're different from the OPL ones)
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- per-channel (possibly) linear volume control separate from TL
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- increased multiplier precision (in 1/16ths)
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- 4-step envelope generator shift (minimum TL)
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- another LFO
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- no per-operator key on/off
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- 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)
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- "reverb" effect (actually extends release)
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unlike the YM2151, this chip is officially undocumented. very few efforts have been made to study the chip and document it...
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therefore emulation of this chip in Furnace is incomplete and uncertain.
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no plans have been made for TX81Z MIDI passthrough, because:
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- Furnace works with register writes rather than MIDI commands
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- the MIDI protocol is slow (would not be enough).
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- the TX81Z is very slow to process a note on/off or parameter change event.
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- the TL range has been reduced to 0-99, but the chip goes from 0-127.
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# effects
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- `10xx`: set noise frequency of channel 8 operator 4. 00 disables noise while 01 to 20 enables it.
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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`: set LFO speed.
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- `18xx`: set LFO waveform. `xx` may be one of the following:
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- `00`: saw
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- `01`: square
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- `02`: triangle
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- `03`: noise
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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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- `28xy`: set reverb 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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- `2Axy`: set waveform 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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- `2Bxy`: set EG shift 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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- `2Cxy` set fine multiplier 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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- `2Fxx`: 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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- `3xyy`: set fixed frequency of operator 1/2.
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- `x` is the block (0-7 for operator 1; 8-F for operator 2).
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- `y` is the frequency. fixed frequency mode will be disabled if this is less than 8.
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- the actual frequency is: `y*(2^x)`.
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- `4xyy`: set fixed frequency of operator 3/4.
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- `x` is the block (0-7 for operator 3; 8-F for operator 4).
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- `y` is the frequency. fixed frequency mode will be disabled if this is less than 8.
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- the actual frequency is: `y*(2^x)`.
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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: +0
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- 1: +1
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- 2: +2
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- 3: +3
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- 4: -0
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- 5: -3
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- 6: -2
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- 7: -1
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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 DT2 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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- `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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