Pricing and availability
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Price
Average Price: $258
Standard/Professional
$150
$601+
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Budget
Standard
High-end
Price History
Based on price data from 6 merchants for "Source Audio C4 Synth". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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Description
Dive into a world of unparalleled sonic exploration with the Source Audio C4 Synth Pedal. This compact powerhouse encapsulates the limitless potential of a classic Eurorack modular synthesizer in a user-friendly, guitar or bass pedal format. Offering an ocean of synth tones, the C4 Synth lets you immerse your instrument in a sea of swirling, buzzing, and pulsating sounds.
The C4 is not just a pedal, but a modular synth in a box, boasting unprecedented tracking abilities and an array of sound options. It is equipped with four parallel voices, three oscillator wave shapes, and more than ten envelope followers, offering a wide range of sound design possibilities.
With the free Neuro Desktop Editor or the Neuro Mobile App, you can unlock a universe of sound sculpting options. From classic synth tones to abstract sounds you've only dreamt of, the Neuro software provides an intuitive and expansive interface for creating your unique sonic masterpieces.
Key Features:
- Compact and user-friendly guitar/bass synth pedal
- Modular synth in a box with unprecedented tracking abilities
- Four parallel voices and three oscillator wave shapes for diverse sound design
- Free Neuro Desktop Editor & Neuro Mobile App for deep sound editing
- 128 Factory presets accessible via MIDI
- Multiple methods of preset storage and recall for seamless plug-and-play experience
- Mix and match any of the C4’s three oscillator wave shapes for pure synth tones
- 11 envelope followers with adjustable attack/decay and ADSR triggering envelopes
- 24 modulating filters, controllable with an envelope follower or independently modulating LFOs
- 14 onboard LFOs for modulation of filter, vibrato, and tremolo
- Run two, simultaneous 16-step sequencer patterns
- Stereo inputs and outputs for multiple routing options
- Universal Bypass: switchable analog buffered or relay-based True Bypass
- USB port for plug and play with Mac and Windows recording software
- Durable, compact anodized aluminum housing with sturdy hardware
- Includes 9V DC power supply (300mA, negative tip; pedal draws 165mA)
Product specs
| Pedal Type | Guitar Synth |
| Analog/Digital | Digital |
| Effects | Neuro Software: Modulating Filters, Distortion, Tremolo, Pitch Shift, Harmonization, Envelope Followers |
| Presets | 128 x MIDI presets, 6 x accessable |
| Inputs | 2 x 1/4" |
| Outputs | 2 x 1/4" |
| MIDI I/O | USB |
| USB | 1 x Mini-B |
| Other I/O | 1 x 1/8" (expression, tap tempo) |
| True Bypass | Yes, Switchable to Analog Buffered |
| Bypass Switching | Relay Based |
| Software | Neuro Desktop Editor/Mobile App (Mac, PC, iOS, Android) |
| Power Source | 9V DC power supply required (included) |
| Power Usage | 165mA |
| Height | 2.0" |
| Width | 2.75" |
| Depth | 4.5" |
FAQs
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What types of effects can the Source Audio C4 Synth Pedal produce?
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The Source Audio C4 Synth Pedal can produce a range of effects including modulating filters, distortion, tremolo, pitch shift, harmonization, and envelope followers, all customizable via the Neuro software.
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How do I access presets on the Source Audio C4 Synth Pedal?
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The Source Audio C4 Synth Pedal allows access to 128 MIDI presets, with 6 presets directly accessible through the pedal itself.
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Is the Source Audio C4 Synth Pedal compatible with expression pedals?
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Yes, the Source Audio C4 Synth Pedal is compatible with expression pedals via its 1/8" input, allowing for real-time control over various parameters.
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Can the Source Audio C4 Synth Pedal be integrated with a DAW?
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Yes, the Source Audio C4 Synth Pedal can be connected to a DAW via its USB Mini-B port, enabling MIDI control and further integration with digital audio workstations.
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Does the Source Audio C4 Synth Pedal support true bypass?
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Yes, the Source Audio C4 Synth Pedal features switchable true bypass, which can be set to analog buffered bypass for maintaining signal integrity in different setups.
Videos
BassTheWorld.com
SOURCE AUDIO C4 Synth Pedal
Reviews
PROS
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Wide range of tones, from subtle to extreme effects
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High-quality tracking, especially for single-line playing
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Programmable with up to 128 presets via the app
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Strong community support for sharing and downloading presets
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Can be used effectively with both bass and guitar
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Includes a variety of effects beyond synth (e.g., wah, octave, phaser)
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Integrates well with external MIDI controllers for expanded control
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Non-intrusive, maintains signal integrity when bypassed
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Versatile for live and studio applications
CONS
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Requires significant time to learn and master
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App necessary for full functionality; pedal less useful without it
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Limited to mostly monophonic use; chord tracking can be problematic
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Some factory presets may not appeal to all users
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External Bluetooth receiver needed for wireless connectivity
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The user interface can be difficult for some to navigate
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Only 6 presets can be stored on the pedal for direct access
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No built-in Bluetooth for direct smartphone connection
Owner Insights
We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Source Audio C4 Synth.
Use cases and applications
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The C4 is used as a creative tool for songwriting, with some owners developing up to 25 diverse presets ranging from synthy to atmospheric sounds.
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The C4 can be used to create not just synth patches but also combine octavers, distortion, envelope filters, and more in a single patch.
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Some users utilize the C4 Synth to enhance live performances, creating patches that simulate a power chord an octave up to fill in rhythm guitar roles.
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The C4 Synth is effectively used to mimic a 12-string guitar effect, although the poly pitch shifts can be slightly warbly.
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Some owners use the C4 Synth primarily as a tweakable envelope filter and octave pedal, complementing their existing pedal setups.
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Users interested in traditional mono-synth sounds, like a detuned saw or Mini-Moog style, find the C4 effective for such applications.
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Mods and upgrades
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Owners recommend using a Source Audio Neuro Hub or similar MIDI controller to switch presets mid-performance, as the pedal itself lacks dedicated buttons for this.
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Comparisons
User experience
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Some users report software bugs such as the pedal being active without the bypass LED, requiring repowering to resolve.
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When used with an expression pedal, the 'reese bass' preset can drop in volume during sustained notes, which is a notable consideration for those using it live.
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Users find it challenging to dial in synth tones due to their complexity, which can limit immediate use in live settings without prior adjustments.
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Software and compatibility
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The Neuro Desktop editor is necessary for deep editing, while live settings benefit from using a DMC MIDI controller to access all 128 presets.
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Connecting the C4 Synth to a Disaster Area DMC MIDI controller via USB makes all 127 presets easily accessible, enhancing its versatility.
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MIDI CC can control nearly any parameter, but links are global for all presets, requiring different MIDI CCs for varying control.
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Features and functionality
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The C4 Synth is backwards compatible with patches from other Source Audio pedals, expanding its utility beyond synth sounds to envelope filters and octavers.
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The C4's modular approach allows swapping sound sources, filters, and drives, but LFO and envelope modulation mix is global for the preset.
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Critic Reviews
5.0 out of 5
Based on 1 Review and 6 Ratings
151
GOATED Synth
Great tracking! Thanks to the community for the presets, infinite things to do with this pedal!
Artist usage
Add artist
Nick posted on his Instagram on 2/27/2020 of his pedal board with a Source Audio C4 synth pedal. Its most likely been spray painted by Nick, but he's labeled all 4 knobs with names consistent with how Source Audio labels their "normal" C4 pedal. It's the purple pedal with "C4" in white on the top right.
This rocks! I love being able to do sub synth with glissando with a guitar! @sourceaudio #c4 #c4synth
Doug Wimbish showcases the Source Audio C4 Synth on his Instagram, highlighting its integration into his pedalboard setup.
Mentioned in interview (Billy Strings' Gear section): https://www.premierguitar.com/artists/guitarists/billy-strings-and-molly-tuttle
John Dieterich uses the Source Audio C4 Synth, as confirmed by Deerhoof's artist page on the Source Audio website.
Album Usage
The Source Audio C4 Synth has been featured on the following albums:
Genre Usage
Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.
Used With
Based on how musicians on Equipboard use Source Audio C4 Synth, it is most commonly used with the following gear.
Community setups
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