A3 Stompbox | Quad Cortex Custom Expression Pedal | Medium Size | w/ Toe Switch\

"The best volume pedal ever with the perfect throw and curve."
- Michael Thompson

"This is great."
- Melvin Davis

"So smooth"
- Nigel Hendroff

"FINALLY, I've gotten to try the A3 Custom Volume. And it's by far the best volume pedal I have ever tried. The taper, resistance and smooth ride, along with the solid and classy build, put it up in the all-time greatest category in my opinion."
- Brett Kingman


A3 Custom EXP offers a super smooth volume curve for precise expression controls and is specially designed for Quad Cortex. The housing is built like a tank using stainless steel making this unit very light but still very robust.

It features A3's indestructible life-time string and custom made potentiometer inside. It has 1 x 1/4" TRS (expression), 1 x 1/4" TRS (toe switch)

The Quad Cortex Custom Expression Pedal introduces full-featured functionality to NeuralDSP's ultra-powerful Quad Cortex modeller and profiler, letting you control and manipulate a wide range of effects processors with expression inputs.

By connecting the Quad Cortex Custom Expression to the pair of expression inputs located on the Quad Cortex, you not only get instant access to silky-smooth expression at your feet, but the pedal's built-in toe switch also makes it a breeze to engage and disengage effects without the need for additional hardware.

Quad Cotex Custom EXP comes in one size - 22.5 x 9.5 x 6.5 cm (1.02 Kg)

A3 Stompbox is the boutique pedal company based in South Korea. The quality is proven after a number of field-testings by the renowned musicians such as Melvin Davis, Michael Thompson, Isaías Elpes, Nigel Hendroff and many more.

A3 Custom products are backed by non-transferable 3 years of warranty for the potentiometer and Life-time warranty for all the other parts of the unit. No questions asked, A3 Stompbox will either repair or replace any defective units under the warranty.