I have tried in the past using clean boosts in the fx loop of amps, as volume boosts for solos. They DO work, but... 1) everything gets brighter, which is a common thing when boosting tubes... it's turning the MV up- that also makes it brighter. 2) if feels kind of "hard", as if I'm actually loosing some compression or something, it doesn't feel as "smooth" as it does without the boost (and I'm not talking gain/grit, it's a feel thing). So I was thinking, what about a compressor? People use them as clean boosts in front of amps all the time, why not in the fx loop? It should give me back some compression/smoothness, and because of the way a compressor works, could also reign in the high transients maybe? I no longer own a compressor (owned several, but gave up on them in from of the amp, just never did anything I wanted), so I can't test it.... but was wondering if anyone has tried this?