Name: Wild Pebble
draft: false
summary: MIDI-clockable generative rhythm and melody organism inspired by Pet Rock
short-description: MIDI-clockable generative rhythm and melody organism inspired by Pet Rock
Language: C++ (Pico SDK + ComputerCard)
Creator: Adrian Vos
Version: "1.0"
Status: Beta
License: MIT
date-created: 2026-06-14
date-updated: 2026-06-25
demo-link: https://www.youtube.com/watch?v=j9mWfKfPwmk
panel:
  inputs:
    - id: PulseIn1
      name: Ext Clock
      description: External clock input; when active it overrides internal tempo clock
      type: pulse
    - id: PulseIn2
      name: Freeze Gate
      description: While held high, mutation updates are disabled and structure is preserved
      type: pulse
    - id: CVIn1
      name: Density Mod
      description: Modulates X density control
      type: cv
    - id: CVIn2
      name: Mutation Mod
      description: Modulates Y mutation control
      type: cv
  outputs:
    - id: PulseOut1
      name: |-
        Primary Trig
        Stream
      description: Main rhythm trigger stream used for melodic progression and kick events
      type: pulse
    - id: PulseOut2
      name: |-
        Companion
        Trig Stream
      description: Derived companion trigger stream used for snare/percussion events
      type: pulse
    - id: CVOut1
      name: |-
        Quant Melody
        CV
      description: Quantized pitch CV from evolving scale-constrained sequence
      type: cv
    - id: CVOut2
      name: |-
        Energy /
        Tension CV
      description: Smoothed evolving modulation output from internal energy and
        tension state
      type: cv
    - id: AudioOut1
      name: Kick Voice
      description: Internal kick/percussion synthesis output driven by primary trigger
        stream
      type: audio
    - id: AudioOut2
      name: Snare Voice
      description: Internal snare/percussion synthesis output driven by companion
        trigger stream
      type: audio
tags: []
controls:
  switch:
    up:
      name: Steady
      description: "Z up: Steady mode. Restrained mutation, tighter rhythms, and the
        calmest phrasing feel."
    middle:
      name: Swaying
      description: "Z middle: Drift mode. Balanced mutation, moderate swing, and
        gradual harmonic movement."
    down:
      name: Rocking
      description: "Z down: Surge mode. Strongest swing, wider melodic leaps, and the
        most animated behavior."
  knobs:
    - main:
        name: |-
          Internal
          Tempo
        description: Internal clock speed with variable swing profile according to
          switch position when internally clocked
      x:
        name: Density
        description: Trigger probability density control (modulated by CVIn1)
      y:
        name: Mutation
        description: Mutation intensity control (modulated by CVIn2)
  leds:
    - display: list
      items:
        - id: LED0
          name: Main Trigger
          description: Flashes when Pulse Out 1 fires.
        - id: LED1
          name: Density
          description: Brightness follows Density control, including CV In 1 modulation.
        - id: LED2
          name: Mutation
          description: Brightness follows Mutation amount, including CV In 2 modulation.
        - id: LED3
          name: Energy
          description: Displays the smoothed internal energy/modulation level.
        - id: LED4
          name: Clock Source
          description: Fully lit when external pulse clock or MIDI clock is active.
        - id: LED5
          name: Tension
          description: Displays the evolving internal tension state.
host:
  notes: >
    Generative rhythm/melody organism with coupled trigger streams, quantized
    melody CV,

    internal kick/snare voices, evolving energy/tension modulation, and USB MIDI
    clock/note

    behavior. Main controls internal tempo when no external clock is present, X
    controls

    rhythmic density, and Y controls mutation amount. The switch selects Steady,
    Drift, or

    Surge behavior, moving from restrained patterns to more animated swing,
    mutation, and

    melodic activity. Pulse In 1 is external clock and Pulse In 2 freezes
    mutation while high.
contact:
  social:
    github: https://github.com/soveda