mirror of
https://github.com/tildearrow/furnace.git
synced 2024-12-02 17:27:25 +00:00
34 lines
1.2 KiB
Markdown
34 lines
1.2 KiB
Markdown
# Yamaha YM2413/OPLL
|
||
|
||
the YM2413, otherwise known as OPLL, is a cost-reduced FM synthesis sound chip, based on the Yamaha YM3812 (OPL2). thought OPL was downgraded enough? :p
|
||
|
||
# technical specifications
|
||
|
||
the YM2413 is equipped with the following features:
|
||
|
||
- 9 channels of 2 operator FM synthesis
|
||
- A drum/percussion mode, replacing the last 3 voices with 3 rhythm channels
|
||
- 1 user-definable patch (this patch can be changed throughout the course of the song)
|
||
- 15 pre-defined patches which can all be used at the same time
|
||
- Support for ADSR on both the modulator and the carrier
|
||
- Sine and half-sine based FM synthesis
|
||
- 9 octave note control
|
||
- 4096 different frequencies for channels
|
||
- 16 unique volume levels (NOTE: Volume 0 is NOT silent.)
|
||
- Modulator and carrier key scaling
|
||
- Built-in hardware vibrato support
|
||
|
||
# effects
|
||
|
||
- `11xx`: set feedback of channel.
|
||
- `12xx`: set operator 1 level.
|
||
- `13xx`: set operator 2 level.
|
||
- `16xy`: set multiplier of operator.
|
||
- `x` is the operator (1 or 2).
|
||
- `y` is the mutliplier.
|
||
- `18xx`: toggle drums mode.
|
||
- 0 disables it and 1 enables it.
|
||
- only in drums system.
|
||
- `19xx`: set attack of all operators.
|
||
- `1Axx`: set attack of operator 1.
|
||
- `1Bxx`: set attack of operator 2.
|