Shadowbox

Open sourceMicro

Turn a Raspberry Pi running RNBO patches into a self-contained performance box with Shadowbox, Stretta's open-source runtime and hardware UI layer for standalone patch control.

Shadowbox is aimed at builders who want RNBO instruments away from the laptop. It auto-discovers RNBO runners and exposes patch browsing, parameter editing, preset management, and audio/MIDI routing from a compact physical interface built around an OLED display and rotary encoder. The project is distributed through GitHub for DIY use, making it a flexible starting point for custom Raspberry Pi instruments and installations.

Released

2026

Status

In Production

Product links

Github repo

Build Difficulty

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Videos

Introducing Shadowbox

Synthesizer

Format

Micro, Experimental

Synthesis

Digital

Battery Powered

DIY Option

Yes

Open source

Yes

Workflow

Arpeggiator

Sequencer

Mod Matrix

Memory

Expression

Aftertouch

Velocity

Additional

Open-source Raspberry Pi runtime/control layer for RNBO patches with a compact hardware UI, OLED display, and rotary encoder. Auto-discovers RNBO runners and provides on-device patch, parameter, preset, audio, and MIDI controls.

I/O

Audio In

Microphone input

Audio Out

Line out

Headphone

Headphone output

Ports

USB, MicroSD Card

Wi-Fi

Last updated May 2, 2026

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Stretta

github.com

Stretta is the maker alias behind Shadowbox, an open-source Raspberry Pi runtime and hardware UI layer for Cycling '74 RNBO patches. The project turns a Pi into a standalone patch controller with OLED and encoder-based editing for patches, parameters, presets, audio, and MIDI routing.

Shadowbox

Product links

Build Difficulty

Videos

Specs

Reviews

Build Difficulty

Reviews

Videos