Lots of tricks there, tho....
If you use Scenes in a more or less sequential manner (i.e., S1, S2, S3, S4, S5, etc.) to change amp block sounds, keep the channel of the amp block you're listening to the same and switch the other's channel to be ready for the next scene, when you'll switch to that amp block and switch channels on the amp block you just stopped listening to. Takes planning, but works nicely for per-song presets.
You can use a filter or drive block, or the amp block's built-in input boost - on a switch or controlled by a Scene Controller.
You could use a Scene Controller or Control Switch to bump up the input drive or other amp block gain/dirt control to a higher setting.
If you want random access, set up bypass on both amp blocks to listen to the same CS, but flip one's status settings so only one is on at a time. Then set up a channel switch per amp to be able to switch channels on the bypassed amp before swapping it in circuit. Three switches to do it, byt as much flexibility as can be had.
Use a pair of volpans in front of two parallel amp blocks to select which gets signal. (My fave trick....) Set up the volume so o e goes 0->10 while the other goes 10->1. If one amp is clean and the other dirty, set the clean amp's volpan taper to Linear and the dirty one to 30%, 20%, or whichever gives closest to an equal volume output throughout the range of the crossfade. Fade smooooooovely between amp sounds. Channel switch the amp you aren't currently listening to so it is on the channel you want when you switch to it.
Use a Multiplexer block after the two parallel amp blocks to select which you hear. Channel switch the amp you aren't currently listening to so it is on the channel you want when you switch to it. Mixer works too, but is better when switched thanwhen faded, as both amps are going full bore in front of it, and the ZIZZIES are audible way before everything else when crossfading if fading from clean to dirty.
There are probably more tricks, but my finger is tired.