I'll attach a preset here. (You may have to set cabs in the Cab block yourself.) I do variations of this depending on the song.
Scene Controller #1 - is on Amp Input Drive and Amp Input Trim.Both of those, when raised, make the patch louder, so I have...
Scene Controller #2 - on the Cab Level. Range is -15db to +3 db.
Then, for each scene, I set Scene Controller 1 to the desired dirt level, and then look at the VU meter, and adjust the Scene Controller 2 to the desired output level.
For this particular preset, I added a timmy with zero drive, to boost for more saturation on one of the scenes, but I rarely need that.