Assign Vibrato to JUP-8V Aftertouch?

[jdoo]

I cant seem to get aftertouch working with JUP-8V patches. Specifically, I would like to add vibrato via aftertouch. Is there a step by step for this (I must be missing something). I *think* I am looking for a way to assign VCO LFO to aftertouch?? Is there a way? Thanks!