draft: false
Name: Turing Machine
short-description: Dual Turing Machine with quantized outputs and tap tempo
Language: C++ (Pico SDK + ComputerCard)
Creator: Tom Whitwell
Version: "1.5.3"
Status: Released
License: GPL-3.0-or-later
Editor: https://www.musicthing.co.uk/web_config/turing.html
date-created: 2024-11-30
date-updated: 2026-07-27
demo-link: https://www.youtube.com/watch?v=ABbWmZOtmig&t=1331s

contact:
  email: tom@musicthing.co.uk
  website: https://www.musicthing.co.uk/
  social:
    github: https://github.com/TomWhitwell
    instagram: https://www.instagram.com/musicthingmodular

tags:
  - sequencer
  - turing-machine
  - random
  - clock
  - cv

summary: |
  Turing Machine turns the Workshop Computer into a random looping sequencer with two channels, configurable presets and multiple scales.  
  
  The Turing Machine was launched by Music Thing Modular in 2012, and is a very popular DIY synth project.

panel:
  inputs:
    - id: PulseIn1
      name: External Clock 1
      description: Replaces tap tempo and drives the main clock
      type: pulse

    - id: PulseIn2
      name: External Clock 2
      description: Overrides the Channel 2 divide/multiply clock and clocks Channel 2 independently
      type: pulse

    - id: CVIn1
      name: Diviply CV
      description: Positive or negative control of the divide/multiply rate for Channel 2
      type: cv

    - id: CVIn2
      name: Pitch Offset CV
      description: Experimental quantized pitch offset applied to both channels
      type: cv

    - id: AudioIn1
      name: Reset
      description: A rising edge resets both sequences to their first step
      type: other

    - id: AudioIn2
      name: Preset Select CV
      description: Experimental CV control for selecting between the two presets
      type: cv

  outputs:
    - id: PulseOut1
      name: Channel 1 Pulse
      description: Clock or Turing-bit pulse, depending on the pulse mode selected in the editor
      type: pulse

    - id: PulseOut2
      name: Channel 2 Pulse
      description: Clock or Turing-bit pulse, depending on the pulse mode selected in the editor
      type: pulse

    - id: CVOut1
      name: Channel 1 Note CV
      description: Quantized pitch CV output for Channel 1
      type: cv

    - id: CVOut2
      name: Channel 2 Note CV
      description: Quantized pitch CV output for Channel 2
      type: cv

    - id: AudioOut1
      name: Channel 1 CV
      description: Scaled DAC signal for Channel 1; output range is configurable in the editor
      type: cv

    - id: AudioOut2
      name: Channel 2 CV
      description: Scaled DAC signal for Channel 2; output range is configurable in the editor
      type: cv

controls:
  switch:
    up:
      name: Preset 1
      description: Selects the first configured output preset

    middle:
      name: Preset 2
      description: Selects the second configured output preset

    tap:
      name: Tap Tempo
      description: Tap the switch down to set the internal tempo when no external clock is connected

  knobs:
    - main:
        name: Random / Loop
        description: Controls randomization and looping for both Turing Machine channels
      x:
        name: Loop Length
        description: Sets the main sequence loop length - 2,3,4,5,6,8,12 or 16
      y:
        name: Diviply
        description: Sets the clock division or multiplication for Channel 2, in relation to Channel 1

  leds:
    - display: list
      items:
        - id: LED0
          name: Channel 1 CV Level

        - id: LED1
          name: Channel 2 CV Level

        - id: LED2
          name: Channel 1 Note Level

        - id: LED3
          name: Channel 2 Note Level

        - id: LED4
          name: Pulse 1 Activity

        - id: LED5
          name: Pulse 2 Activity

host:
  usb:
    - name: Web editor
      role: editor
      description: Browser editor to calibrate various functions of the card. Chrome is recommended