Dear gawd, I've used compression on my acoustic bass live, it sorta works I guess. But OTH it just another in an ongoing series of compromises when amplifying. I think it all started when Ron Carter and Rudy Van Gelder came up with the "glow in the dark sound" on those CTI recordings. Kinda dig that as an effect, but the compression never sounds like that live ime. In a controlled environment it can be ok, but in a live situation it's a crap shoot.