This tiny box turns an RP2040 microcontroller into a playful workstation. AudCalc packs a digital synth, sampler, and sequencer into a micro format that feels experimental but stays surprisingly capable once you start clicking away at its calculator-like buttons.
At its core, AudCalc is a digital, sample-based and noise-oriented instrument with multiple synthesizer engines and built-in reverb and other effects, giving you enough color to move from gritty textures to more polished tones. The sequencer drives internal synth and sample voices or external hardware via MIDI, with options for conditional triggers, re-triggers, and per-voice pattern lengths that let you build evolving, non-repetitive grooves without a sprawling interface.
MIDI in and out over USB, plus sync options inspired by pocket calculators and mini grooveboxes, make it easy to lock AudCalc to the rest of your gear while it handles everything from melodic lines to glitchy percussion. Backed by a compact RP2040 brain and a focus on open hardware and software design, the instrument feels like a handheld lab for exploring clever sequencing tricks and small-format digital sound design.
