furnace/doc/4-instrument/psg.md

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# Sega PSG instrument editor
the instrument editor for Sega PSG, SMS, and other TI SN76489 derivatives consists of these macros:
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- **Volume**: volume sequence.
- **Arpeggio**: pitch sequence.
- **Duty**: noise mode.
- `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.
- only on Game Gear!
- **Pitch**: fine pitch.
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- **Phase Reset**: trigger restart of **noise only**.