Mr Air,
I have tested the FX loop with the Wah. There is definitely a substantial drop in volume level when the FX loop is connected, but it doesn't seem to alter the sound, despite what I thought at first. Will probably need to do some recordings to make sure. But it sounds good to me either way, I wouldn't compare this as muffled under a blanket. And the wah effect sounded better, smoother and more airy/open when used through the FX loop.
Now I can see though how the drop in volume can be an issue if you want to use the amp un-miced at small gigs... As far as I am concerned, it won't be an issue, the headroom is way more then I need anyway.
WIll do the same with the overdrive pedal to see how it goes.
I have been inspired by the latest album for Robin Trower and found a nice setting to find a similar sound out of the neck Boss pup of my Tele. So cool! I didn't use the Brit mode though, still partial for the AC mode at the moment. Listening to this album and reading his interview in the last issue of guitarist have opened new tonal/playing horizons. This guy is brilliant.