My apologies. I assigned the jack to amp, and then reassigned it to exp, and it now works... Must be it was on amp by default or something.
Just to describe it again in case anyone else has the same problem.
The setting originally looks to be Exp 2 - doesn't work
I changed it to Amp 2 - doesn't work
changed it back to Exp 2 - now works
Thank you for all your help!