draft: false
Name: 8mu EQ
short-description: Stereo eight-band graphic EQ, played from the faders of an 8mu
Language: Patcher+
Creator: Chris Johnson
Version: "1.0"
Status: Released
date-created: 2026-10-02
date-updated: 2026-10-02

tags:
  - effect
  - filter
  - equaliser
  - noise
  - midi-host

summary: |
  8mu EQ splits each of the two audio channels into eight octave-spaced bands, from 60Hz to 7680Hz,
  with the level of each band set by one fader of an 8mu. The main knob sets the filter Q, and knob Y
  controls the maximum slew rate of fader movements. Unpatched inputs are normalled to an
  internal white or pink-ish noise source. The 8mu's LEDs show the signal level in each band.

panel:
  inputs:
    - id: AudioIn1
      name: Left In
      type: audio
      description: Left channel input. If AudioIn2 is unpatched, also feeds the right channel. Normalled to noise.
    - id: AudioIn2
      name: Right In
      type: audio
      description: Right channel input. Normalled to AudioIn1 if that is patched, otherwise to noise.
  outputs:
    - id: AudioOut1
      name: Left Out
      type: audio
      description: Sum of the left channel's eight bands, each scaled by its 8mu fader
    - id: AudioOut2
      name: Right Out
      type: audio
      description: Sum of the right channel's eight bands, each scaled by its 8mu fader

controls:
  knobs:
    - main:
        name: Q
        description: Bandpass filter Q, from 0.5 (broad, smooth) to 3.5 (narrow, resonant)
      x:
        name: Unused
      y:
        name: Fader Slew
        description: Rate limit on 8mu fader movement, from about 10s for full travel down to about 50ms
  switch:
    up:
      name: Pink Noise
      description: Unpatched inputs are normalled to pink-ish noise
    middle:
      name: White Noise
      description: Unpatched inputs are normalled to white noise
    down:
      name: White Noise
      description: Unpatched inputs are normalled to white noise
  leds:
    - display: list
      items:
        - id: LED0
          name: Left In Level
          description: Brightness follows the left input signal
        - id: LED1
          name: Right In Level
          description: Brightness follows the right input signal
        - id: LED4
          name: Left Out Level
          description: Brightness follows the left output signal
        - id: LED5
          name: Right Out Level
          description: Brightness follows the right output signal

host:
  usb:
    - name: Music Thing Modular 8mu
      role: controller
      description: >
        Required, plugged into the Computer's USB socket.
        Faders 1-8 set the level of the 60, 120, 240, 480, 960, 1920, 3840 and 7680Hz bands, and the
        8mu's LEDs show the signal level in each band of the left channel.