Being foremost a singer but also playing guitar
at the same time, not to confuse myself in the heat
to much, I've set up my presets as:
The expression pedal is the "first" fx of the preset.
(Usually controlling my Voice fx unit)
F4, the second fx, F3 the third etc,
Then F1 is always a ProgramMessage to
the Voice processor.
There is one preset per song so whatever
comes up first I can hit the F4, whatever it is!
Just one way of doing it, I guess :)