Reassigning Expression Pedal


Can anyone tell me is the following possible?

I have a CP33 piano with an expression pedal, working as advertised to control Sonic. However, I would like to reassign the pedal for certain instruments to another parameter (say wah pedal). I can use the Learn CC feature of Sonic, and the pedal will now control the given parameter, but it still simultaneously controls expression. Is there any way I can un-assign the pedal to expression so that it’s only controlling the learned parameter?

My host is Ableton Live, so any tips on how to do this in the host instead would also be welcome.