Problem with Volume Expression pedal

Can anyone help ? I think I'm probably doing something stupid.

I'm using a M-Audio EX-P Universal Expression Controller Pedal, as a midi controlled volume pedal via my Rocktron Access.

The problem I'm having is that it's not behaving as I'd expect... ie there is not a smooth transition from volume 0 at the heel position and max at the toe position. Basically it's off at heel which I'd expect, then when I move towards the toe it goes a small way with no affect, then jumps to full, so it's acting more like an on/off pedal than a volume/swell pedal.

I've looked in the manual but can't figure out what I'm doing wrong. The volume pedal range in the rig section is set to -5, if I set it to 0 then the heel position is no longer 0 volume...

Is it me or is the pedal knackerd ?

Thanks

Mike

Quote from guitarnet70

Have you calibrated the pedal?

Umm....no...told you it was something stupid .... how do I calibrate the pedal please ...it's connected via midi rather than the pedal sockets on the back of the Kemper. Thanks.