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RiffPi

RiffPi

This site documents RiffPi, the control daemon for Kleag's MFX, a guitar multi-effect pedalboard built around a Raspberry Pi, a Pisound sound card, and Guitarix as the effects engine, housed in a repurposed wooden box. Foot switches, rotary encoders, a keypad, a joystick, and an expression pedal all drive Guitarix over MIDI.

I'm currently at hardware version 2.2.1 of the pedal.

The Multieffect pedal running

The interior of the Multieffect pedal

Where to go next

  • Installation — set up the Raspberry Pi and install RiffPi.
  • Usage — what each control does and how it maps to MIDI.
  • Architecture — hardware wiring, schematic/PCB, and software design.

License

Copyright Gaël de Chalendar, 2025-2026.

This project describes Open Hardware and is licensed under the CERN-OHL-W v2. You may redistribute and modify it and make products using it under the terms of the CERN-OHL-W v2. It is distributed WITHOUT ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING OF MERCHANTABILITY, SATISFACTORY QUALITY AND FITNESS FOR A PARTICULAR PURPOSE — see the CERN-OHL-W v2 for applicable conditions.

Source location: https://github.com/kleag/riffpi. As per CERN-OHL-W v2 section 4.1, should you produce hardware based on these sources, you must keep the source location visible on the external case of the pedal or other product you make using this documentation.