I did a test just now, and that worked: You keep one Cab Block on Channel A in every Scene, loading the totally flat IR, Factory 2 #1024, setting the Mic Pre to High Quality and adjust Gain and Saturation to taste. Now set two IR Player Blocks in parallel feeding into it. You can use a Multiplexer here if you want too. Now you can have eight different IR Player Channels, gapless, going into the one Cab Block. It does work.
But I love the Dyna Cabs!
So I'm going to revert to the idea I had been using most recently before this official release, and still forgoing Channels. I did some side by side testing, and although the Channel switching is so damn fast, it's still not the same as the Multiplexer, Mixer, and Scene Controller method. So I think I'll revert to have two identical rows of two parallel Drive Blocks feeding into one Amp Block and one Cab Block. If I'm on the top row, I start selecting whichever drive, amp and cab channel I want on the bottom row while I'm still playing, then, when I want to switch, just hit that last Multiplexer or Mixer Block before the Output Block to make the completely seamless change. This allows for the use of everything, and is the most gapless method. For complete craziness, you can use Scene Ignore on every Block that allows it, and use Scene Controllers on top of that for one hell of a versatile gapless preset. If I calculate it correctly, you could go the most crazy with it this way, so that for one row you have 9 drives (two drive blocks, with four channels each, including bypass of both for no drive at all) X 4 Amps (one amp block with four channels, X 7 cabs with a mic pre (4 IR Player channels, plus 3 more IR in a cab block, with its fourth channel set to the Totally Flat IR, with the Mic Pre set to taste for all seven IRs) = 9 X 4 X 7 = 262 gapless tones.
So of course that's ludicrous, but it just shows the limitlessness of this. I'm keeping this post in this thread because it is relevant to the faster Channel switching, and I'll quote it in my gapless thread.
By the way, I know what I describing requires a lot of manual tap dancing, but if Eric Johnson can do it, so can I!