I used it for TapTempo a few years back, before I went MIDI on the Factors, but I got someone to make me a little splitter box which had a single TRS 1/4inch female input wired to 3 TRS 1/4inch female outputs. the box did not cost very much and mede it easy to implement TapTempo across all three of the factors…it will work the same for an expression pedal…in fact that was my original plan…but I ended up using it for TapTempo.
Dan from http://this1smyne.com/ makes these sort of things and at a very reasonable price, I got mine from a place in the UK that does not seem to be in business anymore.
