Source Audio ATLAS COMPRESSOR SA 252 Manuel utilisateur

SA252 Atlas Compressor User Guide

Atlas Compressor User Guide

Welcome

Thank you for purchasing the Source Audio Atlas! The Atlas is an all-in-one compressor pedal that

aims to be the ultimate destination for guitar or bass compression and a dive into the deep history of

compressor units. On the surface, the Atlas serves up six unique compressor circuits spanning from

classic stompbox compressors to expensive studio rack gear to ultra-modern and flexible dual-band

compressors.

Connect via USB to the Neuro Mobile App and Neuro Desktop Editors to transform the Atlas into a

DAW compression module with real time gain reduction readout displays and enough controls—such

as Threshold, Attack, Release, Makeup Gain, Ratio, Soft Knee Width, Clean Blend, and a Side Chain

Low-Pass and High-Pass Filters to fine-tune the Atlas Compressor to your exact specifications.

Parameter range controls allow you to set a custom range for each control knob so your tones will

always be in the useable range.

The Atlas Compressor is our love letter to compression and was a collaborative effort between our

trusted engineering duo of Jesse Remignanti (hardware) & Bob Chidlaw (DSP) and Christopher Venter

of SHOE Pedals, who has previously contributed on the ZIO and True Spring pedals. Plug in an Atlas

and experience the final word in audio compression.

—The Source Audio Team

SA252 Atlas Compressor User Guide

Contents

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

Contents .................................................................................................................................................. 2

Feature Overview .................................................................................................................................... 3

Connecting the Pedal .............................................................................................................................. 4

Controls ................................................................................................................................................... 8

ALT Controls .......................................................................................................................................... 10

Atlas Factory Presets ............................................................................................................................. 11

Stereo Operation & Signal Routing ....................................................................................................... 12

Preset Storage and Recall ..................................................................................................................... 13

External Control Options ....................................................................................................................... 14

Expression Control ................................................................................................................................ 15

Neuro Desktop and Mobile Editors ....................................................................................................... 16

The Neuro Desktop Editor ..................................................................................................................... 16

Graphic Equalizer Module ..................................................................................................................... 21

Parametric Equalizer Module ................................................................................................................ 21

Knob Assignment Module ..................................................................................................................... 22

The Neuro Mobile App — with New Direct MIDI-USB Support ............................................................ 24

Neuro Hub ............................................................................................................................................. 25

MIDI ...................................................................................................................................................... 26

USB ........................................................................................................................................................ 27

Specifications ........................................................................................................................................ 27

Troubleshooting .................................................................................................................................... 28

Frequently Asked Questions ................................................................................................................. 28

Rubber Feet ........................................................................................................................................... 30

Waste Disposal Notes ........................................................................................................................... 30

Warranty ............................................................................................................................................... 30

Version History ...................................................................................................................................... 31

SA252 Atlas Compressor User Guide

Feature Overview

Look Ahead Compression: When engaged, Look Ahead creates an imperceptible latency in

the signal that “looks into the future” and allows for an extra quick and smooth attack that

without any additional distortion or artifacts.

Side Chain Compression: Use the signal going to Input 2 to trigger the compression applied

to the signal going into Input 1.

Six Preset Positions: Use the Atlas’s three-position toggle switch and two preset banks to

save six easily accessible presets.

Stereo Ins and Outs: Create two entirely different compression presets and run them in

series, parallel or run each to a separate output.

Bass Optimized Mode: Each of the six onboard compression circuits can be reloaded and

optimized for bass guitar with a simple button press.

Growing Library of Published Presets: For quick and easy 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 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 DAW inspired editor to create custom Atlas

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.

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.

Compact Design: The extruded anodized aluminum housing, with its slim profile and small

footprint, is built for the rigors of the road.

MIDI Capable: Connect the Atlas to the Source Audio Neuro Hub or a USB-MIDI Host and

access up to 128 presets with MIDI Program Change (PC) messages. Control many of the

pedal’s parameters with MIDI Continuous Controller (CC) messages.

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

recording software running on Mac and Windows. The USB port offers connectivity to the

Neuro Desktop Editor as well as the Neuro Mobile App, providing access to deep editing

possibilities and pedal firmware updates.

Universal Bypass™: Select between analog buffered and relay-based True Bypass.

SA252 Atlas Compressor User Guide

External Expression Pedal Control: Make simultaneous, on-the-fly changes of up to three

parameters with an external expression pedal.

Connecting the Pedal

Power

To power the unit, connect the included 9V DC negative-tipped power supply to the jack labeled DC

9V on the back panel. The Atlas needs at least 160mA of current to operate as intended.

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

A power supply with insufficient current levels may also cause noise or other unpredictable behavior.

Please be very cautious when using 3rd-party power supplies and refer to the power supply

requirements in the Specifications section of this guide.

Guitar/Audio Connections

Using standard ¼” mono (TS) 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. If you have a

second amp, connect it to OUTPUT 2.

When the power and audio connections have been made, Atlas is ready for use.

SA252 Atlas Compressor User Guide

Input Side Connections

INPUT 1

INPUT 1 is the primary input for guitar, bass, or other instruments. It can also accept line-level inputs

and will work in your amp’s effect loop. Connect it to your instrument or other audio source using a

mono (TS) 1/4” cable. Details about the appropriate signal levels are available in the Specifications

section.

INPUT 2

Use the secondary audio input for stereo sources or as the data connection to your mobile device

when using the Neuro App.

• INPUT 2 as an Audio Input: The tip contact on INPUT 2 acts as a secondary input for guitar, bass,

or other instruments. Connect your instrument (or the previous effect in the signal chain) using

a mono (TS) ¼” cable. The Atlas will automatically configure itself for stereo audio input. Other

routing options are available using the Neuro App. For more information about stereo routing,

refer to the Stereo Operation section.

• INPUT 2 as a Neuro App Data Input: The ring contact on INPUT 2 acts as a data connection for the

Neuro Mobile App. The Neuro App sends data to the pedal using your mobile device’s

headphone jack. Connect it to your mobile device using the included stereo (TRS) 1/8” to 1/4”

cable. It can also accept 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. This allows audio and Neuro

data to flow on the same cable.

SA252 Atlas Compressor User Guide

Output Side Connections

OUTPUT 1

This is the primary audio output. Connect it to your amplifier, recording interface, or the next device

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

OUTPUT 2

OUTPUT 2 can act either as an audio output or a daisy-chain data connection for the Neuro App.

• 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 Atlas 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 Atlas 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 device’s Neuro App Data input

(usually INPUT 2) using a stereo (TRS) 1/4” 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. This allows audio and

Neuro data to flow on the same cable.

SA252 Atlas Compressor User Guide

Power and Control Connections

DC 9V (Power)

Connect to the included 9 Volt DC power supply. If you would like to use a 3rd-party supply, the

power supply must be regulated at 9 Volts DC (direct current), able to source at least 160 mA

(milliamps) of current, and the plug should have a tip-negative, barrel-positive polarity.

USB

Connect to your computer (Windows or Mac) or mobile device (Android or iOS) to the Atlas’s USB

port (denoted by the icon) using a standard USB mini-B cable. The Atlas is a class compliant USB

device, meaning that it does not require any custom drivers.

CONTROL INPUT

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

Tempo Switch, Source Audio Dual Expression Pedal, and the Neuro Hub. For more information, refer

to the Expression Pedal Input and Neuro Hub sections of the User’s Guide.

SA252 Atlas Compressor User Guide

Controls

Footswitch

Click the footswitch to engage or bypass the pedal. Press + hold the footswitch down while the pedal

is bypassed to bank to Red LED (ALT) Mode for more presets.

Control Input / ALT Button

This small button located at the top of the pedal is used to enable or disable external control. It also

is used to control the ALT parameters on the surface of the pedal. Press + hold the ALT knob while

turning any of the control knobs to access their alternate parameters (see next page for ALT

Controls).

Engage/Bypass LED

The Engage/Bypass LED indicates whether the effect is bypassed or engaged. In ALT Mode (presets

4-6), the LED becomes red when the pedal is engaged.

Gain Reduction

By default, the Engage/Bypass LED also shows gain reduction by changing from green to red

whenever compression is being applied to the input signal. This feature can be turned off in the

Hardware Options section of the Neuro App and Desktop Editor.

SA252 Atlas Compressor User Guide

THRESHOLD Knob

Adjusts the decibel level at which the signal becomes compressed. Turn counterclockwise for a

lower threshold (earlier compression), or clockwise for a higher threshold (a hotter signal is needed

for compression to occur).

RATIO Knob

Adjusts the overall level of compression. Turn clockwise for a higher (flatter) ratio and ultra-

squashed dynamics. Turn counterclockwise for a lower ratio and more subtle compression

BLEND Knob

Adjusts the wet/dry mix of compression. Unlike MIX controls on other Source Audio pedals, the

BLEND control blends in clean signal as the knob is turned up. Therefore, 100% wet (compressed)

signal is at full counterclockwise on the BLEND knob, and 100% dry is at full clockwise on the knob.

OUTPUT Knob

Adjusts the overall output level (wet/dry mix) of the Atlas.

Preset Selector Toggle

Use the Atlas’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.

SA252 Atlas Compressor User Guide

ALT Controls

Pressing and holding the ALT button while rotating the control knobs will adjust their ALT parameter

instead of their normal parameter. Below are a list of ALT parameters and how they correspond to

the normal controls.

Makeup Gain (ALT THRESHOLD)

Adjusts the makeup gain within the compression signal. Makeup gain allows you to recover lost

output volume caused by heavy compression. The Makeup Gain control only affects your

compressed (wet) signal.

Tone (ALT RATIO)

Cuts (below noon) or boosts (above noon) the treble control in the parametric equalizer. By default,

the Treble frequency is set to about 4461Hz, but this frequency can be changed using the Neuro App

or Desktop Editor.

Attack (ALT BLEND)

Attack controls how quickly in milliseconds compression is applied to your input signal. Turn

clockwise for fast attack times and counterclockwise for slower attack times.

Release (ALT OUTPUT)

Release controls how quickly in milliseconds compression “let’s go” or stops being applied to your

input signal. Turn clockwise for fast release times and counterclockwise for slower release times.

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