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A fictional chip created by LTVA. The idea is to fix SID flaws and add more features, but not too much. Unlike SID, it has per-channel volume control, better ADSR envelope which doesn’t have bugs, more waveform mixing modes and the ability to play tonal noise waves. Each channel now has its own independent filter. Filter cutoff and resonance ranges were extended, as well as the frequency; finally, the chip can hit a B-7 note with default clock speed!

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Effects

  • 10xx: Change wave (lower 4 bits specify the wave)
    • Bit 0: Triangle
    • Bit 1: Saw
    • Bit 2: Pulse
    • Bit 3: Noise
  • 11xx: Set resonance (range: 00 to FF)
  • 12xx: Set filter mode
    • 00: Filter off
    • 01: Low pass
    • 02: Band pass
    • 03: Low+band pass
    • 04: High pass
    • 05: Band reject/stop/notch
    • 06: High+band pass
    • 07: All pass
  • 13xx: Disable envelope reset for this channel
  • 14xy: Reset cutoff
    • x ≠ 0: On new note
    • y ≠ 0: Now
    • Not necessary if instrument’s cutoff macro is absolute
  • 15xy: Reset duty cycle
    • x ≠ 0: On new note
    • y ≠ 0: Now
    • Not necessary if instrument’s duty macro is absolute
  • 16xy: Change additional parameters
    • x selects parameter:
      • 0: Attack (y from 0 to F)
      • 1: Decay (y from 0 to F)
      • 2: Sustain (y from 0 to F)
      • 3: Release (y from 0 to F)
      • 4: Ring modulation (y is 0 or 1)
      • 5: Oscillator sync (y is 0 or 1)
      • 6: Filter mode (y is 0 to 7)
      • 7: Waveform mix mode (y is 0 to 3)
      • 8: Noise mode (y is 0 to 3)
      • 9: Phase reset (y is discarded)
      • A: Envelope key on/off (y is 0 (release) or 1 (restart))
      • B: Filter on/off (y is 0 (disable) or 1 (enable))
  • 17xx: Pulse width slide up
    • xx is speed; 00 stops the slide
  • 18xx: Pulse width slide down
    • xx is speed; 00 stops the slide
  • 19xx: Filter cutoff slide up
    • xx is speed; 00 stops the slide
  • 1Axx: Filter cutoff slide down
    • xx is speed; 00 stops the slide
  • 3xxx: Set duty cycle (range: 000 to FFF)
  • 4xxx: Set cutoff (range: 000 to FFF)

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