A full modular rack synth. All in one convenient easy to use pedal. The source audio c4 synth pedal is yet another feat of pedal engineering excellence from source audio. Straight out of the box its loaded with six different synth voices to choose from. So theres plenty of variety in the synth tones you can use with your guitar or bass. And a straightforward 4 knob design means its easy to use.and thats just what comes pre loaded in the pedal. The c4s capabilities extend much further. Thats thanks to their specially designed neuro editing systems software. A mobile app is available for free on the app store and on google play while a free desktop editor is available to download for mac and windows. This gives you access to a huge library of both expert and user created presets. Not to mention the ability to design your own synth voices the possibilities are endless.