furnace/doc/4-instrument/saa.md
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# Philips SAA1099 instrument editor
the SAA1099 instrument editor consists of these macros:
- **Volume**: volume sequence.
- **Arpeggio**: pitch sequence.
- **Duty/Noise**: noise generator frequency. the following values are available:
- `0`: high
- `1`: mid
- `2`: low
- `3`: use frequency of channel 1 or 4 (depending on where the instrument plays).
- **Waveform**: selector between tone and noise.
- **Panning (left)**: output level for left channel.
- **Panning (right)**: output level for right channel.
- **Pitch**: fine pitch.
- **Envelope**: envelope generator settings:
- **enable**: enables the envelope generator.
- **N/A**: has no effect.
- **fixed**: toggles whether to use a fixed, slow frequency or lock to the frequency of channel 2 or 5 (depending on where the instrument plays).
- **resolution**: increases the envelope generator pitch resolution.
- **direction**: inverts the envelope.
- **cut**: cuts the envelope (producing saw wave out of tri wave)
- **loop**: toggles whether envelope is one-shot or constantly looping.
- **mirror**: sets whether the right output will mirror the left one.
- the envelope only has effect in channels 3 and 6.