Thru-Tone EX-S VP Jr. Expression Pedal

Any one try Justin Butler's Modified VP Jr EX-S Expression Pedal with a KPA? I've used his modified VP Jr's back with a regular pedal board and it was great! I always like an EB's feel and taper. I notice it has taper options with a 10k pot. He's a great guy who usually does great work.
(It can be found at http://www.thru-tone.com under pedals.)