Name: USB Audio & MIDI
short-description: 6-channel USB audio interface and USB MIDI device with configurable CV/gate mapping.
Language: C++ (Pico SDK + ComputerCard)
Creator: Vincent Maurer
Version: "1.0"
Status: Released
License: GPL-3.0-or-later
Editor: https://vincentmaurer.de/usb-audio/midi_config.html

contact:
  website: https://vincentmaurer.de
  social:
    github: https://github.com/vincentltm
    youtube: https://www.youtube.com/@vincentltm

tags:
  - usb-audio
  - midi
  - utility
  - cv
  - gate

summary: |
  Class-compliant USB audio and MIDI interface for the Workshop Computer. Maps 6 hardware channels to USB audio streams (Normal Mode), or switches to Alt Mode for 1V/Oct CV, Gate, and Clock MIDI routing. Configurable via the Web MIDI editor and saved directly to flash memory.

panel:
  inputs:
    - id: AudioIn1
      name: Audio Input 1 / USB 1
      description: "Hardware Audio Input 1 (Normal mode: USB Audio Stream Ch 1; Alt mode: Audio In L)"
      type: audio

    - id: AudioIn2
      name: Audio Input 2 / USB 2
      description: "Hardware Audio Input 2 (Normal mode: USB Audio Stream Ch 2; Alt mode: Audio In R)"
      type: audio

    - id: CVIn1
      name: CV Input 1 / USB 3
      description: "Hardware CV Input 1 (Normal mode: USB Audio Stream Ch 3; Alt mode: 1V/Oct pitch CV input)"
      type: cv

    - id: CVIn2
      name: CV Input 2 / USB 4
      description: "Hardware CV Input 2 (Normal mode: USB Audio Stream Ch 4; Alt mode: CC modulation CV input)"
      type: cv

    - id: PulseIn1
      name: Pulse Input 1 / USB 5
      description: "Hardware Pulse Input 1 (Normal mode: USB Audio Stream Ch 5; Alt mode: Note Gate input)"
      type: pulse

    - id: PulseIn2
      name: Pulse Input 2 / USB 6
      description: "Hardware Pulse Input 2 (Normal mode: USB Audio Stream Ch 6; Alt mode: Clock / Run gate input)"
      type: pulse

  outputs:
    - id: AudioOut1
      name: Audio Output 1 / USB 1
      description: "Hardware Audio Output 1 (Normal mode: USB Audio Stream Ch 1; Alt mode: Audio Out L)"
      type: audio

    - id: AudioOut2
      name: Audio Output 2 / USB 2
      description: "Hardware Audio Output 2 (Normal mode: USB Audio Stream Ch 2; Alt mode: Audio Out R)"
      type: audio

    - id: CVOut1
      name: CV Output 1 / USB 3
      description: "Hardware CV Output 1 (Normal mode: USB Audio Stream Ch 3; Alt mode: 1V/Oct pitch CV output)"
      type: cv

    - id: CVOut2
      name: CV Output 2 / USB 4
      description: "Hardware CV Output 2 (Normal mode: USB Audio Stream Ch 4; Alt mode: CC modulation CV output)"
      type: cv

    - id: PulseOut1
      name: Pulse Output 1 / USB 5
      description: "Hardware Pulse Output 1 (Normal mode: USB Audio Stream Ch 5; Alt mode: Note Gate / Trigger output)"
      type: pulse

    - id: PulseOut2
      name: Pulse Output 2 / USB 6
      description: "Hardware Pulse Output 2 (Normal mode: USB Audio Stream Ch 6; Alt mode: Clock / Run output)"
      type: pulse

controls:
  switch:
    up:
      name: Alt Mode (MIDI + Audio)
      description: Enables CV, Gate, and Clock MIDI conversion on jacks 3–6 while keeping stereo audio on channels 1 & 2
    middle:
      name: Normal Mode (6-Channel Audio)
      description: Maps all 6 hardware jacks directly to 6 USB audio streaming channels in your DAW
    down:
      name: Audio Only Mode
      description: Disables USB MIDI processing to dedicate maximum USB bandwidth strictly to audio streams

  knobs:
    - main:
        name: Main CC
        description: Transmits configurable MIDI CC (default CC1 Modulation) when MIDI is enabled
      x:
        name: Knob X CC
        description: Transmits configurable MIDI CC (default CC2 Breath) when MIDI is enabled
      y:
        name: Knob Y CC
        description: Transmits configurable MIDI CC (default CC3 Expressive) when MIDI is enabled

  leds:
    - display: list
      items:
        - id: LED0
          name: USB Mounted
          description: Lights solid when USB host mounts the device

        - id: LED1
          name: Config Status / SysEx
          description: Flashes when SysEx configuration updates are received; indicates USB ready state

        - id: LED2
          name: Audio Out Activity
          description: Lights on USB audio playback stream activity

        - id: LED3
          name: Audio In Activity
          description: Lights on USB audio capture stream activity

        - id: LED4
          name: USB Ready
          description: Lights when TinyUSB hardware stack is initialized and ready

        - id: LED5
          name: 48 kHz Indicator
          description: Lights when operating at 48 kHz sample rate (off at 44.1 kHz)

host:
  usb:
    - name: Web MIDI editor
      role: editor
      description: Web browser app for channel routing, sample rate selection, and flash config storage