Four-track looper and synthesised drum machine: a practice room on the board.

A four-track looper (two minutes a track) with a count-in, a bar counter, bar-snapped non-destructive trim, a level knob and mute per lane, overdub with adjustable feedback, undo, and loops that survive a reload. The looper keeps a rolling pre-roll of its input, so hitting record a fraction late still gives a loop that starts on the beat.

A drum machine with thirty grooves from straight rock through gallop, d-beat, shuffle, 6/8, blast beats and djent, a metronome, swing and humanisation, a kit mix, a parallel-compressed drum bus with a room, and a groove library you can save your own patterns into. A Scales tab shows the key and scale on a readable fretboard with chord grids.

The kit is resynthesised, not sampled: every piece was analysed from recorded drums into tracked partials and a noise spectrum, so the fifteen-piece kit ships as a few megabytes of parameters instead of hundreds of megabytes of audio, every hit differs slightly, and the cymbals keep ringing across strikes. Runs stereo with a mono fold and costs about nine percent of a Pi 5 core.

Place it LAST in the chain, after amp and cab: the looper then records the signal you actually hear, and the drums are not run through your preamp.

Free and open source (GPL-3).

Credit: Ryan Powell