Walrus Audio Canvas Expression Pedal

Walrus Audio Canvas Expression is a next generation expression pedal designed to be the central control hub for modern rigs. With two fully independent outputs that can each act as expression, switch, or control voltage, plus deep MIDI control over USB-C and ⅛” TRS, it replaces multiple single-purpose controllers with one compact, highly configurable unit.

Whether you are morphing delay repeats, sweeping filter cut-offs, switching presets mid-song, driving modular synths or automating plug-in parameters in your DAW, Canvas Expression adapts to the gear you already own. Automatic wiring detection, adjustable tapers and treadle feel, and an intuitive web editor make it quick to set up and easy to reconfigure as your rig evolves.

Dual Independent Outputs

At the heart of Canvas Expression are Jack A and Jack B, which can be configured completely independently. Each output can operate as a traditional expression output, a programmable switch output, or a control voltage source, so you can control two totally different devices at once from a single treadle. From pedals and amps to synths and modular systems, it lets you streamline your board without sacrificing control.

Universal Expression Compatibility

Canvas Expression is designed to work with a wide range of expression-enabled hardware. It supports TRS, RTS and TS resistance modes, and uses automatic wiring detection to remove the guesswork. Adjustable tapers and forward or reverse sweep direction let you dial in exactly how the pedal responds underfoot, so your swells, sweeps and fades feel natural with any connected device.

MIDI Command Centre

Beyond analogue control, Canvas Expression becomes a powerful MIDI controller. It can send up to 16 independently assignable MIDI messages over both USB-C and TRS MIDI, including Control Change and Program Change commands. Use the dedicated web editor to assign smooth, high resolution parameter sweeps or instant preset jumps across pedals, processors, DAWs, virtual instruments and plug-ins, all from one pedal.

Fine Tuned Feel and Fast Setup

Canvas Expression is built to integrate quickly and stay out of your way once configured. Onboard controls and the Canvas web app make it simple to adjust switch behaviour, TS resistance values, global settings and more, while firmware updates keep it current. A straightforward treadle tension adjustment lets you choose a lighter or firmer sweep to suit your playing style, from subtle ambience control to aggressive filter rides.

• Dual Independent Outputs - Jack A and Jack B can each be set as expression, switch, or control voltage outputs, allowing you to control two completely different devices at the same time. This flexibility means one pedal can cover jobs that would normally require multiple dedicated controllers.
• Universal Expression Compatibility - Support for TRS, RTS and TS resistance modes, combined with automatic wiring detection, ensures quick, reliable setup with a wide variety of pedals and devices. Adjustable tapers and sweep direction let you tailor the response so every movement of the treadle translates musically.
• Programmable Switch and CV Control - Each output can be assigned as a switch output with momentary or latching operation, selectable heel, middle or toe activation points, and forward or reverse triggering. Alternatively, generate control voltage in selectable ranges such as 0–5 V or 0–3.3 V, ideal for Eurorack, desktop synths and CV enabled effects.
• Deep MIDI Integration with Web Editor - Send up to 16 MIDI messages over USB-C and TRS, including CC and PC, with high resolution 14 bit USB MIDI support. The Canvas Expression web editor lets you configure MIDI assignments, switch behaviour, TS resistance values, global settings and firmware updates in seconds, making it easy to integrate into both hardware and software based setups.

Control Modes

• Dual independent outputs (Jack A and Jack B)
• Expression output mode
• Switch output mode
• Control Voltage (CV) output mode
• Control two separate devices simultaneously

Expression Compatibility

• TRS wiring support
• RTS wiring support
• TS resistance mode
• Automatic wiring detection
• Adjustable tapers
• Forward or reverse sweep direction

Switching Functions

• Programmable switch output on either jack
• Momentary or latching operation
• Selectable heel, middle or toe activation point
• Multiple switching configurations
• Forward or reverse triggering

Control Voltage

• Selectable voltage ranges
• 0–5 V output range
• 0–3.3 V output range

MIDI

• Up to 16 assignable MIDI messages
• Control Change (CC) support
• Program Change (PC) support
• Independent TRS MIDI output
• USB MIDI over USB-C
• High resolution 14 bit USB MIDI
• MIDI input for remotely enabling or disabling outputs

Configuration and Setup

• Onboard configuration controls
• Canvas Expression web editor
• Configure MIDI assignments
• Configure switch behaviour
• Configure TS resistance values
• Adjust global settings
• Firmware update support via web app

Mechanical

• Adjustable treadle tension
• User adjustable pedal resistance for lighter or firmer sweep