Yeah, that's where I've always used it and thought it sounded great. This thread is what prompted me to start experimenting. When you guys said you were putting it after the output and getting good results, I figured I'd give it a try.
I'm not knocking the Bluesmaster at all...I think its one of the most versatile, unique, ingenious pieces of gear out there. I bought it on a whim as a back up to back ups and I've considered getting a second just in case something happens to it thats not easily fixable.
Have you tried it connected straight to a speaker, using its internal power section? I didn't for a long time after I got it because I didn't think a 1 watt amp in that tiny box could be very impressive and when I did, I was surprised at how good it sounded. Into a 1x12 cab with a K120 it not only sounds good, but louder than I expected. Plenty loud enough for practicing or jamming at moderate volumes without drums.
Anyone starting to put together a rig and trying to keep the cost down...I would highly recommend one of these. If I knew about the Bluesmaster sooner, it would've spared me buying a bunch of crappy amps in the early 90's when I was learning to play and on a budget.