Each track: Q/W/E cycles Rec → Play → Overdub → Play, A/S/D stops it. Space starts/stops everything, Z / Shift+Z undo/redo and Del clears the selected track, M toggles the metronome, T taps the tempo. Actions wait for the next bar (or beat), so every loop is whole bars and the tracks stay in sync; pressing up to ~60 ms after the downbeat still counts as on time. Press again before the bar to cancel. Loops can be up to 90 seconds.