User Guide for Walrus Audio Canvas Volume Pedal

Quick guide from the manual

The Canvas Volume is an optical volume pedal, meaning it contains no strings, pots, or gears to wear out or get scratchy. The user interface is located under the heel of the pedal. It features four parameters: Taper, Minimum On, Gain, and Lag. All settings are managed via two buttons and LED indicators.

Connections

The pedal features multiple input and output options to suit different signal chains:

• IN L: Main input for mono or stereo setups.
• IN R: Right input for stereo setups.
• OUT L: Main output.
• OUT R / TUNER: Configurable output for tuner or dual-mono setups.

Controls

The interface is tucked under the heel of the pedal. It consists of two buttons (left and right) and four parameter LEDs. To edit a parameter:

1. Press the left or right buttons to select the desired parameter (Taper, Min, Gain, Lag).
2. To increase the value: Press and hold the left button while clicking the right button.
3. To decrease the value: Press and hold the right button while clicking the left button.

Parameters

• Taper: Determines the curve of the volume sweep. Taper 1 is custom-designed for guitarists; Tapers 2-6 are modeled after popular volume pedals; Tapers 7-8 are linear, favored by pedal steel players.
• Minimum On: Sets the volume level at the heel-down position. Higher settings reduce attenuation, allowing more signal to pass through at heel-down.
• GAIN: Sets the volume at the toe-down position. Default is Position 5 (unity gain). Settings below 5 reduce volume; settings above 5 boost volume up to +9dB.
• LAG: Introduces a delay to the volume response. Position 1 is fastest; Position 8 adds a 2000ms delay for smooth swells or envelope effects.

Signal Routing

• Mono In, Mono Out, Tuner Out: Connect instrument to IN L, amp to OUT L, and tuner to Tuner jack.
• Stereo In, Stereo Out: Connect left and right signals to IN L and IN R. Connect stereo device inputs to OUT L and OUT R.
• Mono In, Dual Mono Out: Splits the signal from IN L to both OUT L and OUT R. Configure this mode in the Utility Menu.

Utility Menu

To enter the Utility Menu, press and hold both buttons while powering up the unit. Release when all 8 value LEDs light up a single color.

• Factory Reset (Purple): Resets all settings to defaults. Requires recalibration after.
• Sensor Calibration (Red): Calibrates the pedal position sensor. Sweep the pedal between full heel-down and full toe-down two to three times.
• Mono Mode (Yellow): Toggles the right output between Tuner Out and Dual Mono Out.
• DFU (Blue): Used for firmware updates via Walrus Audio support instructions.

Drag Adjustment

You can adjust the physical tension (friction) of the treadle. Locate the 4mm hex screw on the bottom of the pedal. Turn clockwise to increase drag and counterclockwise to decrease drag. Adjust in half-turn increments.

Specifications

• Input Impedance: 1M Ohm
• Output Impedance: 330 Ohm
• Frequency Response: 20Hz to 20kHz
• Power Requirement: Isolated 9VDC, center-negative, 300mA minimum
• Dimensions: 1.9" x 3.6" x 8.9" (48mm x 91mm x 225mm)