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Merge pull request #1240 from ElectricKeet/doc-instr-sms 

Document standard instr. noise modes.
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doc/4-instrument/README.md
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@ -13,7 +13,8 @@ every instrument can be renamed and have its type changed.
depending on the instrument type, there are many different types of instrument editor:
- [FM synthesis](fm.md) - for use with YM2612, YM2151 and FM block portion of YM2610.
- [Standard](standard.md) - for use with NES and Sega Master System's PSG sound source and its derivatives.
- [PSG](psg.md) - for use with TI SN76489 and derivatives like Sega Master System's PSG.
- [NES](nes.md) - for use with NES.
- [Game Boy](game-boy.md) - for use with Game Boy APU.
- [PC Engine / TurboGrafx-16](pce.md) - for use with PC Engine's wavetable synthesizer.
- [WonderSwan](wonderswan.md) - for use with WonderSwan's wavetable synthesizer.

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doc/4-instrument/nes.md Normal file
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# Standard instrument editor
The instrument editor for NES consists of these macros:
- **Volume**: volume.
- **Arpeggio**: pitch in half-steps.
- **Duty**: duty cycle and noise mode.
- pulse duty cycles:
- `0`: 12.5%
- `1`: 25%
- `2`: 50%
- `3`: 75%
- noise modes:
- `0`: long noise.
- `1`: short noise.
- **Panning**: output for left and right channels.
- **Pitch**: fine pitch.
- **Phase Reset**: trigger restart of waveform.

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doc/4-instrument/psg.md Normal file
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# PSG instrument editor
The instrument editor for PSG (SMS, MSX, and other TI SN76489 derivatives) consists of these macros:
- **Volume**: volume.
- **Arpeggio**: pitch in half-steps.
- **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.
- **Pitch**: fine pitch.
- **Phase Reset**: trigger restart of waveform.

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doc/4-instrument/standard.md
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# Standard instrument editor
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