Click or drag to paint steps · Shift-click for a soft hit · click a melodic lane to edit its notes
Export mixdown
Format
How R.E.D.tunes works
Set the groove in the transport: tempo, time signature, length, key and scale. Swing delays every other 16th; Humanize adds tiny timing and velocity drift.
Drums live in the sequencer. Click or drag across steps to paint, Shift-click for a soft ghost hit.
Bass, Piano, Synth, Pluck and Pad are written in the piano roll. Click a melodic lane to open it. Click to add a note, drag to lengthen, drag a note to move it, click it again to delete. Shift-click toggles a soft note. The Chord setting stamps triads or 7ths in key.
Notes are stored as scale degrees, so changing the key or scale re-voices every melody to fit.
Sound design: select a track to shape it with knobs. Drag up or down, Shift-drag for fine control, double-click to reset.
Export renders an offline mixdown as WAV (16 or 24-bit) or MP3, at whatever length you choose.
Space play/pause · Ctrl+Z undo · Ctrl+Shift+Z redo · ? this panel
Changelog
v1.1.0October 19, 2026
Six new demo beats: Liquid Rush, Acid Factory, Piano House, Tom Ritual, Clockwork Waltz and Dub Station. Together the ten demos feature every instrument, plus 3/4 and 12/8 time.
Version number and this changelog in the footer.
The Add Instrument menu now includes every sound used in the demos, grouped by family: Rimshot, Tom Low, Tom Mid, Tom High, Tom Fill, Shaker, Sub Bass, 808, 303 Acid, Dub Bass, Keys, Rhodes, Stabs, Bells, Arp, Skank, Music Box and Melodica.
Footer credit now links to J.D. Sutter's app collection, with the J.D. Sutter monogram below it.
v1.0.0October 16, 2026
First release: 11 synthesized instruments (kick, snare, clap, tom, closed and open hi-hat, bass, piano, synth lead, pluck, pad).
Step sequencer, piano roll with chord stamping, and per-track sound design and mix knobs.
Key, scale, tempo, tap tempo, time signature, length, swing and humanize controls.
Undo and redo, autosave, project save and open, four demo beats.