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Walrus Audio MAKO MKII ACS1 Quick Start Manual

Amp + cab simulator
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The [ACS1]™ is an amplifier and speaker cab simulator delivering the sound and feel of world-
class amplifiers with controllable room size and complimentary speaker cabinets created by Tone
Factor and York Audio. With the ACS1, players have expansive options to deliver their tone on stage,
in the studio, or practicing at home. Simple controls, stereo in and out, onboard presets, and MIDI
support make the ACS1 an immeasurable tool in any guitarist's arsenal.
*The use of an isolated power supply is recommended for powering all Walrus Audio Pedals.
Email help@walrusaudio.com to talk with a real live human about your Walrus gear!
9 volt DC, Center Negative • 300mA min*
Daisy chain power supplies are not recommended.
Got questions or need a repair?
This product comes with a limited lifetime warranty.
Click Here
AMP MODELS
Amp Knob - Press down on the Left encoder to cycle through six different
classic amp models built into the ACS1.
Designed using a detailed physical modeling-based simulation of the
original circuity, each of the cascading triode/filtering stages has been
faithfully replicated, creating complex tones rich with even harmonics
and subtle intercomponent asymmetries/inconsistencies. The power amp
staging has been highly biased to retain plenty of dynamic warmth and
headroom during Class A behavior at low gains, shifting into an increased
sensitivity and overdrive in Class AB saturation to complete Valve breakup
at maximum.
Fullerton: Inspired by the classically snappy and clear Fender® Deluxe
Reverb. Clean headroom that blooms into the fat, rich breakup that
players have come to love over the years.
London: Inspired by a 1962 Marshall® Bluesbreaker with a harmonically
rich, valve-driven breakup. Perfect for sustained lead notes with tons of
gain on tap and a punchy mid-ranged voicing.
Dartford: Inspired by the legendary and jangly tones from a 1960s Vox®
AC30 with all the bite and chime from the British Invasion. Higher gain
settings offer plenty of saturation that represent the loudness and punch
of the original amp cranked.
for more info.

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Summary of Contents for Walrus Audio MAKO MKII ACS1

  • Page 1 ACS1 an immeasurable tool in any guitarist’s arsenal. 9 volt DC, Center Negative • 300mA min* *The use of an isolated power supply is recommended for powering all Walrus Audio Pedals. Daisy chain power supplies are not recommended.
  • Page 2 AMP MODELS: HIGH GAIN Red: Inspired by the distinctively raw and punchy Peavey® 5150, producing heavy, aggressive modern metal and hard rock sounds. Powerful and saturated with a tight low end, strong midrange, and a bright, cutting high end. Citrus: Inspired by the warm, rich, and harmonically complex Orange® Rockerverb.

  • Page 3: Adjusting Parameters

    CONTROLS GAIN VOLUME ROOM LEFT ENCODER MIDDLE ENCODER RIGHT ENCODER LEFT LEFT OUTPUT JACKS INPUT JACKS RIGHT RIGHT BYPASS SWITCH BOOST SWITCH ADJUSTING PARAMETERS When adjusting any knob parameter, you will see a bar appear on the screen. The higher you turn up a parameter, the fuller the bar will appear.
  • Page 4 To change room types: 1. Press down on the Left and Center encoders to enter the global menu. 2. Turn the Left encoder clockwise to scroll down to Room. 3. Turn the Middle encoder to select the type of room sound you want.

  • Page 5: Stereo Controls

    STEREO CONTROLS The ACS1 is capable of running separate amps and/or IRs in each channel. For example, you can run the Fullerton amp on the left and the Dartford on the right then choose to use the same cab for both amps or mix them for unique stereo sounds.
  • Page 6 PRESETS The ACS1 includes 128 total preset slots. Three presets from any chosen bank are accessible from the pedal using both stomp switches. All 128 are accessible via MIDI Program Change messages which are outlined in the MIDI section. o To recall a preset bank: 1.
  • Page 7 GUITAR INPUTS AND OUTPUTS The ACS1 offers multiple input and output configurations and features true bypass circuity. • Mono In / Mono Out • Mono In / Stereo Out • Stereo In / Stereo Out Headphone Jack - The ACS1 features an onboard headphone output for quiet practicing.

  • Page 8: Global Preferences

    MIDI o MIDI CC – Most parameters on the ACS1 can be controlled via MIDI CC messages. The list below shows all applicable MIDI CC numbers and their associated parameters and control values. PARAMETER / MIDI CC # / VALUES / MIDI Range Bass Left 0.0 - 1.0 0 - 127...
  • Page 9 GLOBAL PREFERENCES Bright Adjust the screen brightness level. MIDI Chnl - Select MIDI channel. GLOBAL SOUND PREFERENCES Access the global sound settings menu by simultaneously pressing down on the Left and Middle encoders. Each encoder then cycles through the column of options directly below it on the screen.  Note that the solid white bar behind the text indicates which row of text you have selected.

  • Page 10: Factory Reset

    FACTORY RESET Use the following procedure to restore the pedal to its factory settings. 1. Hold both stomp switches while applying power. The screen will read “Factory reset, hold both stomps 10 seconds.” 2. After 10 seconds the screen will read “Factory reset, now resetting, release both stomps.”...

  • Page 11: Technical Info

    TECHNICAL INFO Input Impedance: 1.1M Ohms Output Impedance: 220 Ohms Frequency Response: 20Hz To 20kHz Inputs: 2, 1/4” unbalanced TS Outputs: 2, 1/4” unbalanced TS USB Type C: For firmware updates via walrusaudio.io Power Requirement: Isolated 9VDC, center-negative, 300mA minimum Size Including Knobs/Jacks: Height: 2.48”...