Raspberry Pi versions: Zero-2W, 3B+, 4, 5

• Multiple song parts (intro/verse/chorus/...). Parts have any number of parallel loops
• Parallel loops of variable length
• Quantization - loop's length, start/stop time is adjusted
• Full history of "undo/redo" for each part
• Parts may be cleared, loops may be deleted on the run
• Silencing and re-arranging of loops in a part
• Loading, saving of songs
• Delay tolerance - allows switching late up to 0.1s
• Binary distribution, installation is simple

• Display looper state in attached screen (ex. 3.5" LCD screen) or in a web browser
• Control of looper via MIDI or computer keyboard
• User configurable menu files: number of song parts, MIDI commands, etc

• Drum machine with tree drum types: Style, MIDI and Loop
• MIDI drum may sync and control external MIDI client, e.g. IOS app
• Style drum is pattern based
• Loop drum uses one song part as drums
• Style patterns and MIDI commands are plain text files easy to edit
• Drums have volume control, swing parameter, variations and breaks/fills