Yeah, you can set the TF for 100% wet, too. There's also a DRYKILL setting in the system menu that globally use a mix value of 100% without changing the mix parameter stored in the preset (TF UM p32). Alternatively, you can turn the GLOBAL MIX on, which would allow you to use the mix knob to set the mix globally (to 100% or any other value), again without changing the stored value (TF UM p40).

I agree, goldglob, that it's worth trying. And yeah, those line mixers can get pretty pricey. Suhr has always made good stuff, though, at least from what I've seen but they aren't the only ones who make line mixers. Your analogy of the 2 guitars into 1 amp is a good one, too, and accurate in my experience.