Alter Ego X4 – How to get expression pedal working??

Alter Ego X4 – How to get expression pedal working??

I have read in the manual the x4 requires 25k linear potentiometer expression pedals.

I have purchased a Boss EV30 thinking it would work, especially with the adjustable minimal volume (and therefore pot value), but it does not. The problems are:
1. It controls feedback and time, when i just want it to control time.
2. It *only just* changes anything from heel down to toe down

I have looked at 15 different expression pedals and NONE are 25k linear. Please help.

Regards
Jye

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Source: http://forum.tcelectronic.com