draft: true
Name: FreqShift
short-description: Dual Input Frequency Shifter for Feedback Experimentation
Language: C++ (Pico SDK + ComputerCard)
Creator: Ben Regnier
Version: 1.1
Status: Released
date-created: 2026-06-14
date-updated: 2026-06-14

tags:
  - frequency-shifter
  - feedback
  - experimental
  - dual-sideband

summary: |
  Dual-input frequency shifter designed for feedback patching and experimental use.
  Main sets shift amount (center = 0 Hz). Switch up uses a wide log-scaled bipolar range (±7000 Hz);
  middle uses a narrower linear range (±440 Hz). X sets internal feedback amount and Y crossfades the audio inputs.
  CV In 1 modulates shift (added to Main). CV In 2 blends the combined feedback path.

panel:
  inputs:
    - id: AudioIn1
      name: Primary Audio Input
      description: Primary audio input for frequency shifting
    - id: AudioIn2
      name: Secondary Audio Input
      description: Secondary audio input crossfaded with Audio In 1
    - id: CVIn1
      name: Shift Modulation
      description: Shift modulation added to Main knob amount
    - id: CVIn2
      name: Feedback Path Blend
      description: Blends combined feedback path down/up balance
  outputs:
    - id: AudioOut1
      name: Low Sideband Output
      description: Lower sideband frequency-shifted output
    - id: AudioOut2
      name: High Sideband Output
      description: Upper sideband frequency-shifted output
    - id: CVOut1
      name: -5V Reference
      description: Fixed -5V reference useful for CV In 2 patching
    - id: CVOut2
      name: +5V Reference
      description: Fixed +5V reference useful for CV In 2 patching

controls:
  knobs:
    - when: { z: up }
      main:
        name: Shift Amount
        description: Wide log-scaled bipolar range (±7000 Hz)
      x:
        name: Feedback Amount
        description: Internal feedback amount
      y:
        name: Input Crossfade
        description: Crossfade between audio inputs
    - when: { z: middle }
      main:
        name: Shift Amount
        description: Narrower bipolar linear range (±440 Hz)
      x:
        name: Feedback Amount
        description: Internal feedback amount
      y:
        name: Input Crossfade
        description: Crossfade between audio inputs
  leds:
    - when: { z: any }
      display: list
      items:
        - id: LED0
          name: Input Level A
          description: Input level indicator
        - id: LED1
          name: Output Level
          description: Output level indicator
        - id: LED2
          name: Positive Shift
          description: Positive shift amount indicator
        - id: LED3
          name: Negative Shift
          description: Negative shift amount indicator
        - id: LED4
          name: Upper Sideband
          description: Upper sideband activity indicator
        - id: LED5
          name: Lower Sideband
          description: Lower sideband activity indicator