Source Audio C4 Synth

Spectrum Audio 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, C4 offers six dynamic synth tones that range from vintage analog to 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 or mobile App, it's easy to browse the ever-growing library of highly inspired presets created by the Source Audio crew and the expanding community of C4 enthusiasts.

• 6 preset positions: use C4's 3-position toggle switch and 2 preset banks to save 6 easily accessible presets

• Growing library of published presets: for quick access to a world of great tones, try sampling sounds from a vast collection of published presets created by the Source Audio team and the ever-growing C4 Neuro community

• Unprecedented sound sculpting options: the powerful Neuro desktop editor and mobile app offer maximum sound exploration possibilities, providing access to a modular synthesizer-inspired editor to create custom C4 Synth presets that can be 'burned' directly to the pedal, saved to a private cloud-based library or shared publicly with other members of the Neuro community

• Supreme tracking: if tracking matters to you – and it should – you will be amazed by C4's lightning-quick, imperceptible latency

• 128 MIDI-accessible factory presets: the addition of a third-party MIDI controller with USB host provides access to any of the pedal's 128 factory presets

• Stereo inputs and outputs: use Neuro's panning controls to route each voice to any location in a full stereo spread

• Compact design: the durable, anodized aluminum housing has a small footprint and sturdy hardware

• Universal bypass: select either analog buffered or relay-based true bypass

• USB port: class-compliant USB MIDI allows C4 to work as a plug-and-play device with recording software running on macOS and Windows or any third-party MIDI controller with USB host

Browse, burn and play

​It's that easy! When you're ready to explore beyond C4's six onboard presets, simply jump to Neuro desktop's cloud tab or the Neuro app's browse function and check out all the available presets created by the Neuro community and the Source Audio team. There's a huge and growing-huger collection of vintage and contemporary synth effects that are guaranteed to amaze. When you find that mind-blowing tone that you can't live without, simply click the BURN icon and upload the preset directly to your C4 – it will be waiting for you at the next gig.

Neuro editing systems

The Neuro desktop editor for macOS/Windows and Neuro mobile app for iOS/Android are both free downloads. Inside Neuro you'll find the tools to create your own personal synth utopia. Use C4's collection of four parallel voices, three oscillator wave shapes, 10+ envelope followers, 20+ modulating filters, distortion, tremolo, pitch shifting, intelligent harmonization, FM synthesis, two programmable sequencers and more to dial in that perfect tone.