MIDI Mutator

MIDI Mutator is a collection of tools to modify any aspect of a MIDI sequence: rhythm, timing, accents, chords & voicings, and shape. Designed for modern and pop music producers.

Available for Windows (VST3) and macOS (VST3, AU) with native Apple Silicon support.

Features:

• Regenerate the rhythm using 6 rhythm generator algorithms from RapidComposer, plus a new one that preserves exact note and rest lengths, suitable for modern genres.
• Use rhythm from another MIDI file.
• Slice a pattern, then rearrange slices randomly.
• Displace notes randomly, randomize note positions and/or lengths.
• Extend, widen, randomize chord voicings, replace the chord progression.
• Change the beat positions to change the feel.
• Replace or randomize accents.
• Increase/decrease polyphony.
• Randomize pitches.
• For monophonic phrases: change the contour, add connecting notes.
• Simple activation. No internet connection is required for activation or operation.