Source Audio C4 Synth Manuel utilisateur

SA249 C4 Synth User Guide 1

C4 Synth User Guide

Welcome

Thank you for purchasing the C4 Synth. This advanced piece of gear offers all the sound construction

tools of a classic Eurorack modular synthesizer and packages them in a compact and easy-to-use

effects pedal for guitar and bass. It is essentially a Eurorack modular synth in a box with

unprecedented tracking abilities, lightning-fast response, and countless sound options. Out of the

box the C4 offers six unique and dynamic synthesizer effects. Connect it to the Neuro Desktop Editor

or Neuro Mobile App and unlock this pedal’s true power. Use the Neuro Editors to create your own

synth sounds with its classic Eurorack inspired editing interface or simply call up an effect from

countless presets created by the Source Audio team or the growing legion of C4 users. Create

incredible tones with the C4’s choice of four parallel voices, three oscillator wave shapes, ten-plus

envelope followers, twenty-plus modulating filters, distortion, tremolo, pitch shifting, intelligent

harmonization, programmable sequencing and more.

The pedal comes in a compact and durable brushed aluminum housing with stereo inputs and

outputs, a three-position toggle switch, a simple four-knob control surface, and full MIDI

functionality via its USB port.

The Quick Start guide will help you with the basics. For more in-depth information about the C4

Synth move on to the following sections, starting with Connections. Enjoy!

SA249 C4 Synth User Guide 2

-The Source Audio Team

Overview

Six Preset Positions: Use the C4’s three-position toggle switch and two preset banks to save six 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 (Free download for

Mac and Windows) and Neuro Mobile App (iOS and Android) offer maximum sound exploration

possibilities. Use Neuro’s 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 publically with

other members of the Neuro Community.

Supreme Tracking: If tracking matters to you (and it should), you will be amazed by the lightning

quick, imperceptible latency of the C4 Synth.

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.

Four Independent Voices: Mix together any of the C4’s four independent Voices. Assign any of the

Voices to an oscillator wave shape, monophonic or polyphonic pitch shifter, intelligent harmonizer,

sequencers, or dry signal to distortion, tremolo, and filter effects.

Three Types of Oscillators: Mix and match any of the C4’s three oscillator wave shapes for pure

synthesizer tones. Choose from sine, square, and saw shaped oscillators.

Eleven Envelope Followers: Select from a comprehensive collection of envelope followers with

adjustable attack/decay as well as ADSR triggering envelopes.

25 Filter Effects: Choose from a huge collection of filters, controllable with an envelope follower or

independently modulating LFOs.

14 Different LFO Wave Shapes: Use LFO (Low Frequency Oscillators) to control the modulation of

filter, vibrato, or tremolo effects. Choose from eight different LFO wave shapes, including sine,

square, sample and hold, saw tooth, and more.

Two Programmable 16-Step Sequencers: Run two simultaneous sequencer patterns. Choose from

several preprogrammed sequencer patterns or create custom patterns.

Stereo Inputs and Outputs: Use the Neuro Editor’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. Dimensions: L: 4.5 in./11.4cm x W: 2.75 in./7cm x H: 2 in./5.1cm (including knobs).

Universal BypassTM –Select either analog buffered or relay based True Bypass.

SA249 C4 Synth User Guide 3

USB Port - Class compliant USB-MIDI allows the C4 to work as a plug-and-play device with recording

software running on Mac and Windows recording software or any third party MIDI controller with

USB host. The USB port also offers connectivity to the Neuro Desktop Editor providing access to deep

editing possibilities and pedal firmware updates.

External Expression and Tap Tempo Control —Use the Control Input jack with the Source Audio

Dual Expression Pedal (expression control to multiple parameters) or Tap Switch (adjust LFO rates on

the fly).

SA249 C4 Synth User Guide 4

The C4 Synth: How Does It Work?

Before diving fully into the C4 Synth and its Neuro Editor, it is important to understand the basic

internal layout and signal path. Below is a simple block diagram that illustrates the C4’s Signal Path

and Resource Blocks:

Step 1. The Voices: First in line are the C4’s Voices (there are four of them, hence the name “C4”).

Assigned each activated Voice to its own Sound Source (Sine, Square, or Saw Oscillator / Monophonic

Pitch / Polyphonic Pitch/ Dry Signal). Mix together multiple Voices to create a single amazing preset.

Step 2. Route the Voices: Send each Voice to either Processor Path 1 (Drive 1, Filter 1, etc.) or

Processor Path 2 (Drive 2, Filter 2, etc.). Route each individual Voice through your desired blocks: the

Drive, the Filter, or directly to the Wet Mix.

Step 3. Program Your Resource Blocks: Use the Resource blocks (blue blocks in the diagram) to do

things like control Filter Modulation, set Pitch Shifting intervals, program the Sequencers, and more.

Step 4. Set Your Output Path: Decide which Voice goes to which of the Stereo Outputs.

SA249 C4 Synth User Guide 5

Quick Start

Power

To power the unit, connect the included 9V DC power supply to the jack labeled DC 9V on the back

panel. When running a 3rd party power supply, the C4 Synth requires an isolated 9V DC power source

with a minimum of 165mA and a center-negative plug.

Warning: Using a non-Source Audio supply, especially an unregulated supply, could damage the unit.

Please be very cautious when using 3rd-party power supplies.

Guitar/Audio Connections

Using standard ¼” mono cables, connect your guitar, bass, or other instrument to the INPUT 1 jack

and your amp (or the next audio device in the signal chain) to the OUTPUT 1 jack. When running a

stereo rig, also use Input and Output 2.

Once the power and audio connections have been made, the C4 is ready to play.

Brief Knob, Footswitch, and Button Descriptions

Please note that the INPUT/SENS and MIX/VOL knobs each control two different parameters. To

access the secondary parameters (SENS and VOL –printed with white graphics), press the ALT

(Alternative Function) button located on top of the pedal. Upon pressing the ALT button the ALT LED

(small LED on the top face of the pedal) will begin to blink indicating the accessibility of the Alternate

knob parameters. The secondary parameters will remain accessible while adjustments are being

SA249 C4 Synth User Guide 6

made then automatically switch back to the primary parameters five seconds after the last knob

adjustment.

INPUT/SENS Knob: A dual function knob that adjusts the level of INPUT signal going to the processor,

and also the SENSITIVITY of the envelope filter. To access the

•INPUT (the Primary (Default) Parameter): Adjusts the volume level of the input signal. Given

the reactive nature of the C4’s pitch detectors and envelope followers and the varying output

levels of different instruments and their passive or active pickups, it is important to set the

level of signal going to the processor. The C4 also includes a simple process for calibrating

your instrument to the INPUT level (go to the INPUT/SENSE Knob section for calibration

instructions).

•SENSITIVITY (the Alternate Parameter): Adjusts how reactive the envelope filter is to the

incoming signal. If you like to play hard, but still want a smoother, more relaxed envelope

filter, you should turn down the SENSITIVITY. For a sharper response to lighter playing, turn

up the SENSITIVITY.

MIX/VOL Knob: A dual function knob that adjust the overall wet/dry MIX and also adjusts the overall

output VOLUME.

•MIX (the Primary (Default) Parameter): Adjusts the balance between the natural dry tone of

the instrument and affected wet signal. A 50/50 mix of wet dry signal resides at roughly 12

o’clock on the knob.

•VOLUME (the Alternate Parameter) Adjusts the master VOLUME/Output of the pedal. Keep

in mind that the overall VOLUME will likely vary depending on the signal density of the preset.

CONTROL 1 and CONTROL 2: The functions of these knobs vary depending on the selected synth

engine.

Effect Selector Toggle Switch: Use the C4’s three-position toggle switch and two preset banks to

easily access six different presets. First Preset Bank (Indicated by the green center LED): default the

center toggle switch selects between three presets stored in the first bank of presets. Second Preset

Bank (Indicated by the red center LED): Pressing the ALT button on the topside of the pedal opens

access to the second bank of presets. After pressing the ALT button the small LED at the top of the

pedal’s face will start to blink, indicating that the second preset bank is accessible with the toggle

switch. Upon moving the toggle switch the center LED will turn red indicating the current preset is

drawn from the second bank.

Footswitch: Enables or bypasses the effect. Also, pressing and holding the footswitch from the

bypassed state toggles between the first and second preset banks.

ALT (Alternate Function) Button: The small black button located on the topside of the pedal next to

the CONTROL INPUT jack. Pressing the ALT button temporarily puts the pedal into Alternate Control

Mode (indicated by the blinking top center LED). Alternate Control Mode switches from the Primary

to Secondary function of the INPUT/SENS and MIX/VOL knobs. Also moving the center toggle switch

will switch between the Green and Red Preset Banks (go to the Preset Banks section for more info).

SA249 C4 Synth User Guide 7

Contents

Welcome..................................................................................................................................................1

Overview..................................................................................................................................................2

The C4 Synth: How Does It Work?...........................................................................................................4

Quick Start ...............................................................................................................................................5

Connections.............................................................................................................................................8

Controls..................................................................................................................................................11

Accessing the Green and Red Preset Banks...........................................................................................14

Three Different Preset Modes ...............................................................................................................14

Universal Bypass TM................................................................................................................................15

External Control.....................................................................................................................................16

Neuro Mobile App & Neuro Desktop Editor..........................................................................................19

Browse, Burn, and Play!! .......................................................................................................................19

The Neuro Desktop Editor .....................................................................................................................19

Daisy-Chaining Neuro Communication..................................................................................................40

MIDI Through the USB Port or Neuro Hub ............................................................................................41

C4 Synth Specifications..........................................................................................................................43

Troubleshooting.....................................................................................................................................44

Frequently Asked Questions..................................................................................................................45

Rubber Feet ...........................................................................................................................................46

Waste Disposal Notes............................................................................................................................46

Warranty................................................................................................................................................47

Version History ......................................................................................................................................48

SA249 C4 Synth User Guide 8

Connections

Input Side Connections

Input 1

This is the primary input for guitar, bass, or other instruments. It can also accept line-level inputs of

up to +6.54 dBV / 8.76 dBu. Connect it to your instrument or other audio source using a mono (TS) ¼”

cable.

Input 2

Input 2 acts as either a second audio input, the data connection for the Neuro Mobile App, or an

input for both audio and Neuro Data simultaneously.

Input 2 as an Audio Input

The tip contact on Input 2 acts as a secondary input for guitar, bass, or other instruments. It is only

active when the C4 is configured with a signal routing option that uses stereo inputs. Connect it to

your instrument (or the previous effect in the signal chain) using a mono (TS) ¼” cable. By default,

the C4 will auto-detect the routing mode. Other routing options are available using the Neuro Mobile

App or Desktop Editor. For more information about stereo routing, refer to the I/O Routing Options

section.

Input 2 as a Neuro App Data Input

The ring contact on Input 2 acts as a data connection for the Neuro App. Connect it to your mobile

device using a stereo (TRS) ¼” cable. It can also accept simultaneous audio and daisy-chained Neuro

data from another Neuro-compatible pedal in the chain, provided that a TRS cable is used. The audio

signal (if applicable) will be on the tip contact of the plug, and the Neuro App data will be on the ring

contact.

Input 2 accepts data from the Neuro Mobile App. Data from the Neuro Hub comes through the

CONTROL INPUT port.

SA249 C4 Synth User Guide 9

Output Side Connections

Output 1

This is the primary mono Output. Connect this Output to your amplifier, recording interface, or the

next device in your effects signal chain using a mono (TS) ¼” cable.

Output 2

Acts as either an audio output, the daisy-chain data connection for the Neuro App, or both audio and

Neuro Data simultaneously.

Output 2 as an Audio Output

The tip contact on Output 2 acts as the secondary audio output. It carries an audio signal when the

C4 is configured with a signal routing that uses stereo outputs. Connect it to your amplifier, recording

interface, or the next device in your effects signal chain using a mono (TS) ¼” cable.

Output 2 as a Neuro App Data Daisy-Chain Output

The ring contact on Output 2 acts as a data connection for the Neuro App, passing data from the C4

to the next Source Audio effect in your signal chain. You can daisy-chain the Neuro App data

regardless of whether Output 2 is configured to output audio or not. Connect Output 2 to the next

pedal’s Neuro App Data input (Input 2) using a stereo (TRS) ¼” cable. The audio signal (if applicable)

will be on the tip contact of the plug, and the Neuro App data will be on the ring contact. See the

Daisy-Chaining Neuro Communication section for more info.

SA249 C4 Synth User Guide 10

Power and Control Connections

DC 9V (Power)

Connect to the included 9 Volt DC power supply. The power supply must be regulated at 9 Volts

(direct current), able to source at least 165 mA (milliamps) of current, and the plug should have a tip-

negative, sleeve-positive polarity (the center tip is ground and the sleeve is power).

USB

Connect your computer (Mac or Windows) to the C4’s USB port (denoted by the icon) using a

standard mini USB cable. The USB port handles communication between the pedal and the Neuro

Desktop Editor or a digital audio workstation (DAW). The C4 will also respond to MIDI messages from

an external MIDI Controller with USB host support. The C4 is a class compliant USB device, meaning

that Mac and Windows computers will recognize it automatically. For more information about the

C4’s USB capabilities, refer to the USB section of the User’s Guide.

CONTROL INPUT Port

The 3.5 mm CONTROL INPUT Port connects to external control devices such as the Source Audio

External Tap Switch, Dual Expression Pedal, Neuro Hub, and Hot Hand 3 Motion Controller. For more

information, refer to the External Control and Neuro Hub sections of the User Guide.

ALT (Alternate) Button

The small black button located on the topside of the pedal, next to the CONTROL INPUT jack.

Pressing the ALT button temporarily puts the pedal into Alternate Control Mode (indicated by the

blinking top center LED). Alternate Control Mode switches from the Primary to Secondary function of

the INPUT/SENS and MIX/VOL knobs. Also moving the center toggle switch will switch between the

Green and Red Preset Banks (go to the Preset Banks section for more info).

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