Chord Attractor

Pick a key. See its notes, its interval pattern, and every chord built on it.

The melody generator is deliberately chaos-driven rather than plain-random: pitch, velocity, and note length are all sampled from a logistic map — x[n+1] = r·x[n]·(1−x[n]) — run in its chaotic regime. The strange attractor at the heart of that chaos engine is where the app's name comes from.

You can use a MIDI keyboard for note input, and also output MIDI instead of the internal synthesizer.

G generate a fresh pattern · H this help window · P chord progression window · M melody generation window · S Song window (Copy Song, download MIDI) · Digits 1-8 mute/unmute tracks · R Record mode · in Record mode: N/I/F/X or Tab select Note/Instrument/FX1/FX2 (Shift+I/F/X opens a picker), Enter inserts a note, O inserts OFF, Alt+↑/↓ or +/- edits, Delete clears (whole selection if one is active) · Home jumps to step 1 of the current track · Shift+arrows select · Ctrl+C/V copy/paste (paste: Record mode only) · Ctrl+Z/Y undo/redo · C Chain mode (Left/Right slot, Up/Down chain #) · E edit the cursor cell's instrument (synth patch editor, type to preview) · Space play pattern (Shift+Space loops it), Ctrl+Space play Song