furnace/doc/4-instrument/saa.md

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# Philips SAA1099 instrument editor
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The SAA1099 instrument editor consists of these macros:
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- **Volume**: volume sequence
- **Arpeggio**: pitch sequence
- **Duty/Noise**: noise generator frequency
- **Waveform**: selector between tone and noise
- **Panning (left)**: output level for left channel
- **Panning (right)**: output level for right channel
- **Pitch**: fine pitch
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- **Envelope**: envelope generator settings:
enable: enables the envelope generator
N/A: has no effect
fixed: toggles whether to use a fixed frequency or lock to the frequency of channel 2 or 5
resolution: increases the envelope generator pitch resolution
direction: inverts the waveform around Y axis
cut: cuts the waveform (producing saw wave out of tri wave)
loop: toggles wheteher evelope is one-off or constantly looping
mirror: sets whether the right output will mirror the left one