[sorry...a bit of rambling here]
@Greg Ferguson (and others) I've found managing solo levels to be a bit of a challenge. I've settled into a single-patch setup where I have acoustic (using IRs), bandmaster clean, AC20 crunchy, and Trainwreck rock scenes. The scenes change via MIDI control from my iPad as we change songs in the sets. While I'm in a song, I have an effects layout displayed. Most of the time, stepping on a footswitch for a drive block is perfect for that extra push. But, I've run into situations where it wasn't quite loud enough to cut through or was jarringly loud. As much as I've tried dialing in these levels at rehearsal on the performance page; at the gig, I'm often surprised. Maybe it's the acoustics of the room....or it could be how our bandleader set our levels at sound check. And, as I'm using IEMs - which adds more complexity. So, rather than fight perfection, I'll just use an expression pedal to adjust levels on the fly.
My previous "all-in-one" patch used to have a stand-in switch mapped to a GEQ block at the end of the signal chain with a +3dB boost plus a little mid-hump. That worked reasonably well but not always. I'm finding that I can play most of the gig with the acoustic scene and Bandmaster scene (+ drive block). I've set up a second footswitch next to the drive footswitch to cycle through the drive block channels. That gives me enough flavors of dirt for the material. Adding the AC20 and Trainwreck scenes complicates things as there are more levels to deal with. Which kinda sucks as I really love the way those amp models clean up on the guitar's volume....but they also compress a lot rather than punch through.
I'll take that advice about moving the volume block after the cab. While trails aren't that significant for our music, it does seem to work smoother.
</ramble>
[edit - I just realized I posted this in the FM3 section and I've moved to the FM9. Old habits...]