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Document standard instr. noise modes.

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Electric Keet 2023-07-13 16:35:55 -07:00
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doc/4-instrument/standard.md
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The instrument editor for NES and PSG (SMS, MSX, and such) consists of these macros:
- **Volume**: volume
- **Arpeggio**: pitch in half-steps
- **Duty**: duty cycle and noise mode for NES channels. _Note:_ This has no effect on Sega Master System.
- **Panning**: output for left and right channels
- **Pitch**: fine pitch
- **Phase Reset**: trigger restart of waveform
- **Volume**: volume.
- **Arpeggio**: pitch in half-steps.
- **Duty**: duty cycle and noise mode.
- NES noise modes:
- `0`: long noise.
- `1`: short noise.
- PSG noise modes:
- `0`: short noise, preset frequencies.
- `1`: long noise, preset frequencies.
- `2`: short noise, use channel 3 for frequency.
- `3`: long noise, use channel 3 for frequency.
- **Panning**: output for left and right channels.
- **Pitch**: fine pitch.
- **Phase Reset**: trigger restart of waveform.