[HAM] Vibrato for aux/guitar input?

[jess robbins]

Thanks to Eric Pratt I just got my guitar plugged into my M-100 at the
RCA input on the pedal housing.  It sounds SWEET clean, as well as
(especially) through the reverb.  My question is:  Is it possible to
route the guitar signal so that it runs through the vibrato as well?
-Jess