The PGB-1 is an open-source, pocket-sized groovebox and MIDI sequencer built around a dual-core RP2040 microcontroller. Measuring just 10 x 6.6 x 1.5 cm, it fits in the palm of your hand and is smaller than a smartphone.

The PGB-1 features 19 synthesis engines across 6 channels, 2 sampler channels, 16 LFOs, 4 master effects, and 16 tracks of sequencing with 16-step patterns per track. It includes onboard sampling via internal microphone or line-in, song mode, chord sequencer, arpeggiators, and live sequencing effects.

The device includes a 128x64 OLED display, 25 RGB LEDs, 30 tactile switches, and a capacitive touch strip for a tactile playing experience. Connectivity includes USB-C (power and data), 3.5mm headphone out, 3.5mm audio line-in, and TRS MIDI I/O. The open-source firmware supports CircuitPython, C/C++, and Ada for deep customization.

Powered by a built-in rechargeable Li-ion battery with a built-in speaker, the PGB-1 is designed to be truly portable and hackable, making it suitable for musicians, developers, and makers alike.