General / Accessories
Electro-Harmonix EHX Expression Pedal
Quick guide for the Electro-Harmonix EHX Expression pedal. Learn how to connect, adjust sweep direction, polarity, and range settings for optimal performance.
Table of contents
Quick guide from the manual
The EHX Expression pedal is designed to control expression parameters on various devices equipped with an expression jack. To ensure proper operation, always use the included 1/4 inch TRS cable, as standard TS instrument cables are not compatible.
Controls and I/O Jacks
TRS OUT Jack: Connect your device here using the provided 1/4 inch TRS cable. The pedal will not function correctly with a standard TS instrument cable.
REV Button: Controls the sweep direction of the pedal. When set to the OUT position, the sweep is standard (minimum to maximum as you move from heel to toe). Pressing the button to the IN position reverses this behavior (maximum to minimum).
TRS +/- Button: Adjusts the polarity of the TRS jack for compatibility with different devices. For EHX pedals, keep this button in the OUT position. If the pedal does not achieve a smooth sweep, try toggling this setting.
RANGE Knob: Adjusts the minimum setting of the expression pedal. Setting the knob to 10 provides the full sweep range. Turning the knob towards 0 moves the minimum sweep setting closer to the fixed maximum.
Technical Specifications
Internal Potentiometer Impedance: 10kΩ
Practical help
Common problems
Pedal does not achieve a smooth sweep over the full range
Try changing the TRS +/- button setting.
Pedal is not working or controlling the device
Ensure you are using a 1/4 inch TRS cable. Standard TS instrument cables will not work.
Before use
- Connect the pedal using the included 1/4 inch TRS cable.
- Set the REV button to OUT for standard sweep direction.
- Set the TRS +/- button to OUT if using with an EHX pedal.
- Adjust the RANGE knob to 10 for full sweep range.
Specs in practice
- Internal Potentiometer Impedance
- 10kΩ - The electrical resistance value of the pedal's internal control component.
Model compatibility
- Compatible with any device featuring an expression jack.
- Requires a TRS cable; standard TS instrument cables are incompatible.
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.