Find your rhythm.

Open a Standard MIDI file (.mid or .midi), choose the right-hand and left-hand sources below, then press play. Notes move toward the piano keys on your right; the left-hand board lights up the current button in yellow and the next button in red. Tap any piano key or bass button to hear it. Use Space to play/pause and ← / → to move five seconds.

For a combined piano track, use “Split by note” for both hands and choose a split point. Chord detection works best with simultaneous, block-chord accompaniment. Free-bass runs and complex piano voicings may not correspond to a single Stradella button. The bass board is on your left, with counterbass nearest the bellows. The piano is on your right, with high notes toward the top. Use Flip piano to reverse the key direction. Use Flip board if your preferred bass direction differs.