Model: 900-1057mkII
The Walrus Audio Mako Series MKII ACS1 is an advanced amplifier and speaker cabinet simulator designed to provide the sound and feel of world-class amplifiers. It integrates complimentary speaker cabinet Impulse Responses (IRs) from Tone Factor and York Audio, along with controllable room size simulation. This device offers extensive options for delivering guitar tone in various settings, including live performance, studio recording, and home practice. Its user-friendly controls, stereo input and output capabilities, onboard presets, and MIDI support make it a versatile tool for guitarists.
The ACS1 features six distinct amplifier models, each inspired by historically significant amplifiers, and twelve cabinet IRs meticulously designed by industry experts to ensure optimal tonal representation. Custom IRs for the Fullerton, London, and Dartford amp models were engineered by David Hislop and Kenyon Reed at Tone Factor, while Justin York of York Audio designed the IRs for the Red, Citrus, and Tread amp modellen.
The ACS1 features a straightforward control layout and versatile connectivity options. Refer to the images below for a visual guide to the pedal's components.

Figuur 1: Voorzijde View of the Walrus Audio Mako Series MKII ACS1. This image displays the pedal's top panel, including the six control knobs (VOL, GAIN, ROOM, BASS, MIDDLE, TREBLE), the central display screen, and the two footswitches (BYPASS and BOOST/PRESET). The Walrus Audio logo and "AMP + CAB SIMULATOR" text are also visible.

Figure 2: Input Side View. This image shows the right side of the pedal, featuring the Mono (L) and Stereo (R) input jacks. These are used to connect your instrument or other pedals to the ACS1.

Figure 3: Output and Power Side View. This image displays the left side of the pedal, showing the Mono (L) and Stereo (R) output jacks, along with the 9V DC power input jack. The power requirements (9VDC, 300mA) are also indicated.
Connect a 9V DC (center negative) power supply with a minimum of 300mA to the power input jack on the left side of the pedal. Ensure the power supply meets these specifications to prevent damage.
The ACS1 is designed to be placed at the end of your pedal chain, before your amplifier or directly into a mixer/audio interface, to simulate the full amplifier and cabinet sound.
Once powered on, the ACS1 will display its current settings. Use the BYPASS footswitch to engage or disengage the effect. The BOOST/PRESET footswitch can be used to cycle through presets or engage a boost, depending on the configured mode.
The top row of knobs (VOL, GAIN, ROOM) and the bottom row of knobs (BASS, MIDDLE, TREBLE) directly control the parameters displayed on the screen. Turning these knobs will adjust the corresponding values.

Figure 4: EQ and Cabinet Selection. This close-up of the ACS1 display shows the Bass, Middle, and Treble EQ settings, along with the selected cabinet (CAB 1) and its type (LONDON). The L+R indicator suggests stereo operation.
The display screen allows you to navigate and select different amplifier models and cabinet IRs. Consult the full Walrus Audio manual available on their website for detailed instructions on menu navigation and parameter selection. The ACS1 comes pre-loaded with six amp models and twelve cabinet IRs.
The ROOM knob adjusts the simulated acoustic space around the amplifier and cabinet. This adds depth and realism to your tone. The display will show the current room type and size.

Figure 5: Room Settings Display. This image shows the ACS1 display indicating the "ROOM" parameter, with "TYPE ROOM 2" and "SIZE" visible, allowing users to adjust the simulated room acoustics.
The ACS1 supports onboard presets, allowing you to save and recall your favorite settings. The BOOST/PRESET footswitch can be configured to cycle through these presets. Refer to the official Walrus Audio documentation for detailed instructions on saving, loading, and managing presets.

Figure 6: Preset Selection Interface. This display shows the "PRESET" menu, with options for selecting different preset slots (A, B, C) and their corresponding numbers (0, 2).
The ACS1 includes additional features accessible through its menu system:

Figure 7: Noise Gate Settings. This image shows the ACS1 display with the "GATE" menu active, allowing adjustment of "THRESH" (Threshold) and "REL" (Release) parameters for noise reduction.

Figure 8: Main Menu Options. This display shows the main menu, providing access to "PRESET", "ROOM", and "OUT EQ" settings, among others.
The ACS1 allows users to load their own Impulse Responses (IRs) and update the pedal's firmware. This functionality is managed through the Walrus Audio webplaats. Op bezoek komen walrusaudio.io for detailed instructions and software tools required for these operations.
For further troubleshooting or issues not covered here, please refer to the official Walrus Audio support resources.
| Functie | Specificatie |
|---|---|
| Modelnummer | 900-1057mkII |
| Artikelgewicht | 12.7 ounces (361 gram) |
| Productafmetingen | 5.8 x 4.2 x 2.7 inch |
| Energiebron | DC Power Supply |
| Deeltage | 9 Volt (DC) |
| Huidige opname | 300mA (minimum) |
| Aansluitingstype | 1/4" (6.35mm) TRS Jack, Stereo Audio Socket (SAS) |
| hardware Interface | SAS |
| Signaalformaat | Analoog |
| Audio-uitvoereffecten | Reverb, EQ, Noise Gate, Amp EQ |
| Bedieningstype | Knob, Footswitch |
| Eerste Beschikbaar | 25 september 2024 |
Walrus Audio products are designed and built to high standards. For information regarding warranty coverage, product registration, and technical support, please visit the official Walrus Audio website of neem contact op met de klantenservice.
Officieel Webwebsite: walrusaudio. com
Firmware & IR Management: walrusaudio.io
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