Dunlop XP Series Expression Pedal for Neural DSP Quad Cortex

The Dunlop XP Series Expression Pedal for Neural DSP Quad Cortex is an expression pedal made by Dunlop, designed to sit alongside the Quad Cortex and put modeler parameters under your foot: volume, wah, and whatever else the unit lets you assign to an expression input. Dunlop lists it at $189.99.¹

What an expression pedal does here

An expression pedal does not pass your guitar signal. It sends control data to the modeler, so rocking the pedal changes a parameter in real time: sweep a filter, fade a volume, open a wah. On the Quad Cortex, that means the pedal becomes a performance control for the sounds the unit generates, rather than a pedal in the chain itself.

The XP Series family

Dunlop builds the XP Series as a set of pedals, each matched to a specific modeler's expression input. The Quad Cortex version follows the same idea as its siblings, and the family pages show what Dunlop emphasizes across the line²⁴¹:

The common thread is calibration: Dunlop's claim for the family is that each version is matched to the response of the device it is made for, so the heel-to-toe sweep tracks evenly across its travel instead of bunching up at one end. On the Kemper and Helix versions, a toe switch adds a second function, letting you turn an effect on and off with a push of the toe, the way a built-in wah pedal works.¹²⁴

Hooking it up

The XP for TMP page gives the clearest picture of the wiring the family expects: it requires one TRS cable and one standard instrument cable.³ A TRS (tip-ring-sleeve) cable carries the expression control signal to the modeler's expression input, so it is worth having one on hand; a ordinary guitar cable will not do that job.

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