Thanks, and interesting idea about adding a ring mod. I tried adding a mild chorus and it sounded fairly convincing, I'll be interested to try a light ring mod in it's place at my next chance.
Agreed on sound quality and programming, blows any previous multi I've tried right out of the water, and compares really well to individual pedals!
I agree with @gregmon79 on IRs as well. Haven't even bothered with the factory IRs. But I "impulse" purchased (see what I did there? HA HA HA

) the Red Wirez IR libraries for the Hartke 4.5XL, Ampeg B15 and Aguilar DB115 today. Holy bejeebers there's a lot of files... four sample rates, two bit rates per sample rate, 15 mics per sample rate and 36 IRs per mic.

Will hopefully have a chance to mess around with some of them tonight!
Regarding expression control: If it's effecting things that aren't active, that probably means you have the inactive effect assigned to the same expression controller. (i.e. Block #1 and Block #2 both have parameters assigned to Expression 1). Interesting that Line 6 would have it programmed to effect the inactive block as well. Hmmmm. Not sure how to solve that aside from having a 2nd Exp controller and assign the separate pedals to the separate blocks.
To expand on what Gregmon said about routing... Once you have the paths split, you can select the split/merge points just like a block and move them around to where you want them to be in the chain.
I've only recently started exploring Snapshots, and find myself struggling with it a little as well. I get the concept, but a wondering if maybe I'm doing something wrong. In my main patch, I'd like to have an UP Auto Filter on Snapshot 1, but a DOWN Auto Filter on Snapshot 2. I'm not changing any of the blocks, but when I change the setting on the Auto Filter to DOWN, it changes Snapshot 1 as well. I've consulted the manual, but I must just be missing something. I only messed with Snapshots briefly, and it was at the end of a long day... "Meh, I'll figure it out later!"

ha ha
Another +1 for how cool the HX is. It's pretty much changed my upcoming board build plans, and has inspired me to clean out the effects bin... I've got a BUNCH of effects stuff that will be going up for sale. Quite refreshing!
5sg.