TA-15 / MIDI MUTATION

MIDI Mutation Lab

Load a MIDI riff, bassline or melody and generate controlled variations without throwing away the identity of the original phrase. Lock rhythm, pitch or velocity, mutate what you want, edit the result and export it.

LIVE · BROWSER LOCAL

TA-15 / MIDI MUTATION

MIDI Mutation Lab

Variation without amnesia: keep the phrase recognizable while pushing selected musical dimensions.

MUTATE

DROP A MIDI FILE HERE

Standard MIDI files (.mid / .midi). ToneAnvil imports note events and tempo, merges note tracks for editing, and exports a clean note-focused MIDI variation.

LOCAL PROCESSING · YOUR MIDI DOES NOT LEAVE THE BROWSER

SOURCE MIDI—

NOTES—

LENGTH—

SOURCE BPM—

EXPORT BPM KEY SCALE RHYTHM GRID VARIATION STRENGTH SEED

PITCH MUTATION RHYTHM MUTATION VELOCITY MUTATION LENGTH MUTATION OCTAVE CHANCE DENSITY CHANGE

TRANSFORMATIONS

ORIGINAL—

MUTATED / EDITABLE—

DIRECT NOTE EDITDrag note vertically = pitch · horizontally = start · drag right edge = duration · click = select

SELECTED NOTE — Click a note in the mutated piano roll to edit it.

PITCH START LENGTH VELOCITY

AVG PITCH SHIFT—

AVG TIMING CHANGE—

AVG VELOCITY CHANGE—

SIMILARITY—

How controlled mutation works

Every generated variation starts from the imported notes. The global strength sets the ceiling, while pitch, rhythm, velocity and length controls decide how much each dimension can move. Locks completely freeze selected dimensions. With Scale-Aware Pitch enabled, mutated pitches are snapped to the selected key and scale.

Transformations vs random mutation

Generate Variation is seed-based and probabilistic. The transformation buttons are deterministic operations applied to the current variation: pitch inversion mirrors intervals around the phrase center, retrograde reverses note order in time, rotate shifts the rhythmic pattern around the phrase length, and humanize adds small timing and velocity deviations.

What is preserved on import

ToneAnvil focuses on note data. It reads note events and the first detected tempo, but does not preserve controller automation, program changes, SysEx, lyrics or complex multi-tempo maps. Export is a new format-0 note-focused MIDI file.