The FunBox is an open source digital guitar pedal platform developed by GuitarML and designed around the very capable Daisy Seed STM32 chip by Electro-Smith. It features buffered stereo input and output, as well as expression and midi input via 1/8" TRS cables. Its design and effects were inspired by high-end audio brands such as Meris, Chase Bliss, and NeuralDSP. GuitarML has developed a suite of open source effects available on Github including the following:

Venus: A Spectral Reverb that uses a Short Time Fourier Transform to create orchestral string-like soundscapes.

Mars: Amp Sim/Delay using advanced Machine Learning to model real amps/pedals.

Jupiter: A Reverb shaper that uses EQ to create anything from realistic room reverbs to never ending impossible spaces.

Saturn: Spectral Delay that uses a Short Time Fourier Transform to split your signal into hundreds of individually delayed frequency groups.

Neptune: A Reverb/Delay with reverse/octave delays producing ethereal soundcapes.

Pluto: A wacky Dual/Stereo Variable Speed Looper with real time effects such as reverb, stability, and tone control.

MidiKeys: A midi keyboard controlled synth using physical modelling and traditional synthesis techniques.

All of the above effects are coded in c++, but the Daisy Seed can also be programmed in PureData or Max/Gen, or Arduino.

The hardware controls include 6 potentiometer knobs, 3 three way toggles, two footswitches, and four dip switches. Use one of the pre-made effects or design your own!

The Funbox uses a 125B sized enclosure with a drill template available through Tayda Electronics. The PCB is a through hole design, soldering required.

A detailed build guide is available on Medium:

Build Guide Link

YouTube Demo Links:

Mars AmpSim/Delay

Venus Spectral Reverb

Neptune Reverb/Delay

Pluto Dual Looper

MidiKeys Synth