draft: false
Name: Voices of SID
short-description: "Dual MOS 6581 SID emulation (reSID engine) with CV/gate control, stereo output, waveform selection, and randomize"
Language: C++ (Pico SDK + ComputerCard)
Creator: Joep Vermaat
contact:
  email: joep@joep-i.nl
  website: https://codeberg.org/johantv/
Version: 1.1
Status: Released
License: MIT
date-created: 2026-06-07
date-updated: 2026-06-08
Repository: https://codeberg.org/johantv/voices-of-sid

tags:
  - synthesizer
  - sid
  - chiptune
  - dual-voice
  - cv-gate

summary: |
  Two emulated MOS 6581 SID chips run in parallel on separate audio outputs.
  Switch middle is Play mode (CV/gate, Main = decay/release, X = resonance, Y = pulse width).
  Switch up is Sound Edit (X/Y select waveforms for each voice; gates open for drone/tuning).
  Hold switch down to randomize attack, sustain, waveforms, ring mod, and sync.
  CV and pulse inputs pass through to outputs for chaining modules.

panel:
  inputs:
    - id: CVIn1
      name: Voice 1 Pitch CV
      description: 1V/oct pitch for SID1 lead voice and ring/sync carrier
    - id: CVIn2
      name: Voice 2 Pitch CV
      description: 1V/oct pitch for SID2 second voice
    - id: PulseIn1
      name: Voice 1 Gate
      description: Gate for voice 1 (high = gate open)
    - id: PulseIn2
      name: Voice 2 Gate
      description: Gate for voice 2
  outputs:
    - id: AudioOut1
      name: SID 1 Output
      description: Left output — SID chip 1 (lead + ring-mod/sync carrier voices)
    - id: AudioOut2
      name: SID 2 Output
      description: Right output — SID chip 2 (second voice)
    - id: CVOut1
      name: CV 1 Passthrough
      description: 1:1 copy of CV In 1
    - id: CVOut2
      name: CV 2 Passthrough
      description: 1:1 copy of CV In 2
    - id: PulseOut1
      name: Gate 1 Passthrough
      description: 1:1 copy of Pulse In 1
    - id: PulseOut2
      name: Gate 2 Passthrough
      description: 1:1 copy of Pulse In 2

controls:
  knobs:
    - when: { z: middle }
      main:
        name: Decay/Release
        description: Decay/release time (0–15, shared by both voices)
      x:
        name: Filter Resonance
        description: SID filter resonance (0–15)
      y:
        name: Pulse Width
        description: Pulse width shared by both voices (minimum 40)
    - when: { z: up }
      main:
        name: Decay/Release
        description: Decay/release time (same as Play mode)
      x:
        name: Voice 1 Waveform
        description: Selects voice 1 waveform (8 stops)
      y:
        name: Voice 2 Waveform
        description: Selects voice 2 waveform (8 stops)
    - when: { z: down }
      main:
        name: Randomize
        description: Hold to continuously randomize attack, sustain, waveforms, ring mod, and sync

  leds:
    - when: { z: up }
      display: list
      items:
        - id: LED0
          name: Voice 1 Waveform Bit 0
        - id: LED1
          name: Voice 1 Waveform Bit 1
        - id: LED2
          name: Voice 1 Waveform Bit 2
        - id: LED3
          name: Voice 2 Waveform Bit 0
        - id: LED4
          name: Voice 2 Waveform Bit 1
        - id: LED5
          name: Voice 2 Waveform Bit 2
    - when: { z: middle }
      display: list
      items:
        - id: LED0
          name: Gate 1 Active
        - id: LED1
          name: Gate 2 Active
        - id: LED3
          name: Voice 1 Waveform Bit 0
        - id: LED4
          name: Voice 1 Waveform Bit 1
        - id: LED5
          name: Voice 1 Waveform Bit 2