tildearrow Sound Unit

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Capabilities

• 8 channels of either waveform or sample
• Stereo sound
• 8 waveforms (pulse, saw, sine, triangle, noise, periodic noise, XOR sine and XOR triangle)
• 128 widths for the pulse wave
• Per-channel resonant filter
• Ring modulation
• Volume, frequency and cutoff sweep units (per-channel)
• Phase reset timer (per-channel)

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Effects

• 10xx: Set waveform
  • 0: Pulse wave
  • 1: Sawtooth
  • 2: Sine wave
  • 3: Triangle wave
  • 4: Noise
  • 5: Periodic noise
  • 6: XOR sine
  • 7: XOR triangle
• 12xx: Set pulse width (range: 0 to 7F)
• 13xx: Set resonance of filter (range: 0 to FF)
  • Despite what the internal effects list says (0 to F), you can use 0 to FF (255)
• 14xx: Set filter mode and ringmod
  • Bit 0: Ring mod
  • Bit 1: Low pass
  • Bit 2: High pass
  • Bit 3: Band pass
• 15xx: Set frequency sweep period low byte
• 16xx: Set frequency sweep period high byte
• 17xx: Set volume sweep period low byte
• 18xx: Set volume sweep period high byte
• 19xx: Set cutoff sweep period low byte
• 1Axx: Set cutoff sweep period high byte
• 1Bxx: Set frequency sweep boundary
• 1Cxx: Set volume sweep boundary
• 1Dxx: Set cutoff sweep boundary
• 1Exx: Set phase reset period low byte
• 1Fxx: Set phase reset period high byte
• 20xx: Toggle frequency sweep
  • Bit 0-6: Speed
  • Bit 7: Up direction
• 21xx: Toggle volume sweep
  • Bit 0-4: Speed
  • Bit 5: Up direction
  • Bit 6: Loop
  • Bit 7: Alternate
• 22xx: Toggle cutoff sweep
  • Bit 0-6: Speed
  • Bit 7: Up direction
• 4xxx: Set cutoff (range: 0 to FFF)

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Chip Configuration