Song structure: 7 sections - Intro, Verse, Chorus, Verse 2, Bridge, Chorus 2, Outro. Each can be enabled/disabled and set to 2-16 bars.
Instruments: 4 tracks per section: Drums, Bass, Chords, Melody. Choose from pattern library.
Pattern library: Each instrument has 4 patterns (3 musical + Silent). Use +/- to cycle.
Playback: Play full song or solo the selected section.
BPM & Key: Click BPM or Key labels to adjust. All sections share the same BPM and key.
Demo songs: Load pre-made arrangements: Rock Anthem (130 BPM), Chill Lo-Fi (85 BPM), EDM Banger (128 BPM).
Save/Load: Store your arrangement in browser localStorage.
Keys: Space=Play, S=Play Section, 1-7=Select section, D/R/L/E=Demo.