The Source Audio C4 Synth is a modular synthesizer engine packed into a compact One Series pedal. With four parallel voices, multiple oscillator wave shapes, 20+ modulating filters, envelope followers, distortion, pitch shifting, harmonization, and programmable sequencing, the C4 delivers everything from classic synth tones to abstract soundscapes — all from your guitar or bass.

Four Parallel Voices

Each of the C4's four Voice Blocks can be independently configured with:

• Voice types: Dry Signal, Monophonic Pitch Shifting, Polyphonic Pitch Shifting, or Synth Oscillator (Sine, Square, Saw)
• Individual level, stereo panning, distortion/fuzz, filter engage, pitch modulation, and detuning

Deep Signal Processing

• Distortion Block: Soft Clipping, Foldback, Gated Fuzz — dial in drive and clean/dirty mix
• Filters Block: 20+ filter types with envelope follower or LFO modulation, sensitivity, depth, frequency, and Q/resonance controls
• Three onboard guitar/bass synthesizer effects for instant plug-and-play tone

Neuro Editor Integration

• Free Neuro Desktop Editor (Mac & Windows) and Mobile App (iOS & Android)
• Deep per-voice editing: oscillators, envelopes, FM synthesis, harmonization, sequencing, and more
• Save, publish, and download presets from the Neuro community library
• 128 user presets recallable via MIDI

Specs

• Dimensions: 4.5" x 2.75" x 2" (L x W x H, including knobs)
• Weight: 1 lb
• Power: 9V DC, center negative (PSU included)
• Housing: Brushed anodized aluminum
• MPN: SA249