draft: true
Name: Vink
short-description: Dual delay loops with sigmoid saturation for Jaap Vink / Roland Kayn style feedback patching
Language: C++ (Pico SDK + ComputerCard)
Creator: Ben Regnier
Version: 1.1
Status: Released
date-created: 2025-12-01
date-updated: 2026-01-28

tags:
  - delay
  - feedback
  - saturation
  - dual-tap
  - experimental

demo-link: https://www.youtube.com/watch?v=X_Bcr_HS9XM

summary: |
  Vink provides two independently time-modulated delay taps with optional sigmoid saturation blend.
  Main controls base delay time, X controls tap 2 offset, and Y crossfades dry to saturated output.
  In switch up, outputs are split per tap; in middle/down, taps are mixed to mono on both outputs.
  CV In 1 and CV In 2 modulate tap times. Pulse outputs track tap periods.

panel:
  inputs:
    - id: AudioIn1
      name: Audio Input 1
      description: Delay source input (or left source in split mode)
    - id: AudioIn2
      name: Audio Input 2
      description: Optional second source; summed in shared mode or routed to tap 2 in split mode
    - id: CVIn1
      name: Tap 1 Time Mod
      description: Modulates delay time for tap 1, averaged with Main knob target
    - id: CVIn2
      name: Tap 2 Time Mod
      description: Modulates delay time for tap 2, averaged with Main+X target
  outputs:
    - id: AudioOut1
      name: Delay Tap 1 / Mono Mix
      description: Tap 1 output in split mode, or mono sum in shared mode
    - id: AudioOut2
      name: Delay Tap 2 / Mono Mix
      description: Tap 2 output in split mode, or mono sum in shared mode
    - id: CVOut1
      name: Chaos CV A
      description: Slow chaotic CV from internal logistic-map LFO
    - id: CVOut2
      name: Chaos CV B
      description: Slow chaotic CV from second logistic-map LFO
    - id: PulseOut1
      name: Tap 1 Period Pulse
      description: Pulse train based on tap 1 delay period
    - id: PulseOut2
      name: Tap 2 Period Pulse
      description: Pulse train based on tap 2 delay period

controls:
  knobs:
    - when: { z: up }
      main:
        name: Base Delay Time
        description: Sets shared center delay time for both taps
      x:
        name: Tap 2 Offset
        description: Offsets tap 2 delay relative to tap 1
      y:
        name: Saturation Mix
        description: Crossfades dry delayed signal to sigmoid-saturated signal
  switch:
    up:
      name: Split Routing
      description: Independent input/output routing per tap
    middle:
      name: Shared Routing
      description: Mixed dual-delay output on both outputs
    down:
      name: Shared Routing
      description: Same routing behavior as middle # certainty: high (code groups center/down)
  leds:
    - when: { mode: activity }
      display: list
      items:
        - id: LED0
          name: Audio Out 1 Level
          description: Brightness follows output 1 level
        - id: LED1
          name: Audio Out 2 Level
          description: Brightness follows output 2 level
        - id: LED2
          name: Chaos CV A
          description: Brightness reflects CV Out 1 state
        - id: LED3
          name: Chaos CV B
          description: Brightness reflects CV Out 2 state
        - id: LED4
          name: Tap 1 Pulse
          description: Lit while Pulse Out 1 is high
        - id: LED5
          name: Tap 2 Pulse
          description: Lit while Pulse Out 2 is high