Compact, portable MIDI synthesizer powered by the XIAO ESP32-C3 MCU and the SAM2695 MIDI chip. This pocket-sized instrument delivers rich sound through a built-in speaker, supports up to 64-voice polyphony, and provides 128 preset instrument sounds for immediate play and exploration. Key benefits and why you need it: - Instant music creation with no setup required: plug-and-play design, three preset modes, built-in speaker, and four tactile side buttons let beginners and hobbyists start composing right away. - All-in-one workflow: integrated MIDI sound engine and metronome let you set tempo by tap, toggle a drum track, and control beats without extra devices or apps. - Expandable and hackable platform: open-source hardware and software allow developers and sound designers to customize firmware, build new sound engines, or extend hardware via the XIAO socket. - True portability: compact dimensions 71 mm by 49 mm by 28.5 mm fit in a pocket so you can capture ideas anytime. Main features: - Core modules: XIAO ESP32-C3 MCU and SAM2695 MIDI chip for reliable MIDI synthesis. - Sound and polyphony: up to 64 voices of polyphony and 128 preset instrument sounds available. - Playback and sequencing: multitrack playback with four independent tracks, each with programmable sequences and on off control. - Metronome mode: tap tempo to set BPM, BPM range 40 to 240 with a default of 120, and a drum-track on off switch for practice and performance. - Sound test mode: switch between 128 preset timbres and play notes across MIDI range 21 to 108 with C4 at MIDI note 60 as default. - Controls: four tactile side buttons for note input, global volume, and mode switching using short and long presses. - Audio and power: built-in Class-D amplifier and speaker, 3.5 mm audio jack for external speakers or headphones with automatic amplifier mute when a cable is inserted, and 5V Type-C power input. - Indicators: single-color LED for power and status feedback. - Software and connectivity: supports Arduino IDE and standard MIDI 1.0 protocol for integration with MIDI gear and development workflows. - Case and customization: white 3D-printed case provided and fully open source for remixing and custom enclosures. Practical applications: - On-the-go sketching: capture melodic or rhythmic ideas anywhere using the built-in speaker and compact form factor, then refine them later on a computer. - Practice and composition: use the metronome, drum-track, and multitrack playback