Chord Mode: Click keys to select root note, choose chord type (maj/min/dim/aug/7/maj7/min7), click Play.
Progression Mode: Fill chord slots to create a sequence. Click Play to hear the progression at current BPM.
Arpeggiate: Toggle to play chord notes one at a time instead of simultaneously.
Presets: Quick-load common progressions like I-IV-V-I, I-V-vi-IV, ii-V-I.
BPM: Click +/- to adjust playback speed (60–200 BPM).
Keys: Z=prev octave, X=next octave, 1-7=select root, Q=play, W=arpeggiate toggle.