In the words of Source Audio:

The C4 Synth unites all the sound creation tools of a classic Eurorack

modular synthesizer and packages them in a compact and easy-to-use

effects pedal for guitar or bass. Out of the box the C4 offers six

dynamic synth tones that range from vintage analog to the thoroughly

modern. It is essentially a modular synth in a small pedal with

unprecedented tracking abilities, lightning-fast response, and countless

sound options. With the addition of the Neuro Desktop Editor (a

free download for Mac and Windows machines) and Mobile App. (for iPhone

and Android) it's easy to browse from the ever-growing library of

highly-inspired presets created by the Source Audio crew and the

expanding community of C4 enthusiasts.