KeyAware Pitch Delay (JUCE)

A tempo-synced delay that repitches repeats diatonically (key-aware) instead of using fixed semitone intervals.

Features

• Tempo-synced delay time (musical divisions) or ms
• Key & scale selection (Major/Minor + a few extras)
• Two pitch modes:
  • Mode 1 (Interval / diatonic degrees): each repeat shifts by a scale-degree interval (e.g. +2 degrees = “3rd up”), staying in key
  • Mode 2 (Scale tone sequence): each repeat snaps to specified scale degrees (e.g. 1, 5, 3, 7)
• Two routing modes:
  • Serial: pitch shifter in the feedback loop (classic “harmonizer delay” feel; indefinite repeats)
  • Parallel (phrase loop): multi-tap phrase of length N * baseDelay, with feedback from the last tap so the pattern repeats without overlapping
• Pitch source options:
  • Audio (built-in monophonic pitch detector)
  • MIDI (use last played MIDI note as reference)
  • Fixed (user-selected reference note)
• Wet/Dry mix, Feedback, Output gain, Ratio smoothing
• Per-step Level and Pan (classic multitap feel)
• Custom scale editor (12 semitone toggles) in addition to presets
• Advance on transient option (sequence phase advances when an input onset is detected)
• Snap repeats to chord mode (feed MIDI chords to constrain the repeat notes)
  • Chord Snap Mode: Override (allow chord tones outside the scale) or Intersect w/ Scale

Build (macOS)

1) Get JUCE

Either:

• Clone JUCE into this folder as ./JUCE

or

• Pass -DJUCE_DIR=/path/to/JUCE to CMake

2) Configure + build

cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
cmake --build build --config Release

Outputs will include:

• AU (.component)
• VST3 (.vst3)
• Standalone app

Known limitations

• The audio pitch detector is best on monophonic sources (vocals, bass, leads).
• The pitch shifter is a lightweight granular shifter; extreme shifts can create artifacts (often still musically usable for delay effects).