Groovesizer Hardware

Apr 24, 2026 · 2 min read

Overview

Together with MoShang, we are building an ESP/ARM-based version of the Groovesizer granular synthesizer. Groovesizer is a DIY granular synth originally running on Atmel chips. It features two voices, a step sequencer, patch saving, and a simple but elegant interface designed for live performance.

The goal of this project is to modernize the hardware and extend it with AT Protocol integration, turning it into a networked, interoperable instrument.

AT Protocol Integration

Adding ATProto connectivity to the Groovesizer hardware opens up several possibilities:

  1. Live state sync — Share knob and switch state between devices in real time during a live setup.
  2. Preset sharing — Publish saved presets on a button press; load them on another device instantly.
  3. PDS persistence — Store live and preset state on a Personal Data Server (PDS), making patches available across the ATProto network and interoperable with other apps. Includes backup via PDSMover and event triggers via If-This-Then-AT.
  4. Universal controller via panproto — Share live and patch state across hardware devices and software synths, making the Groovesizer a universal controller for AT-enabled music instruments.

Groovesizer Blue — Workshop Edition

A workshop-ready kit designed to be accessible for beginners:

  • PCB arrives pre-soldered, with only a few through-hole parts (e.g. jumper connectors) left for manual assembly.
  • Switches and potentiometers are connected via jumper cables that can be hand-soldered before the session.
  • Optimized for build workshops where participants complete a working instrument in a single session.