furnace/doc/4-instrument/saa.md

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.