Thanks Kilrahi, that's a few things I'll definitely try when it arrives today!
I had a thought though - if I'm sending the signal to the real amp, AND to the FOH, should I set the Stomp to Line level or instrument level? The signal going to the mixer will need Line level I guess, but my amp will want instrument level?
I usually plug into the front of my amp but I guess I could plug into the FX loop and bypass the preamp that way? It's a nice amp (Suhr Badger 35), but as you say, I have no idea how much colouring of the sound it'll do.
Is what I'm proposing to do a bit unusual then? I assumed that having the signal going to the backline and to FOH would have been fairly normal?