I can recall from time to time on these boards, there have been discussions of mastering methodology where someone will be using a psycho-acoustic bass enhancer on the master bus, and the idea always gets shut down- it's better to fix in in the mix, boost more low frequencies on the appropriate individual tracks, etc. I am always of the notion that things should be adjusted and corrected in the mix as much as possible rather than "fixed" on the master bus, but what I've been wondering as of late, is if things like the Waves Renaissance Bass actually have any value. I've got a pretty killer mix going at the moment, it translates well to other systems, the low end is about right...but I started messing with the RBass on the individual bass guitar track just for fun, and I really do love the way it sounds with just a SLIGHT increase in the perceived sub low range (32-45Hz). I started experimenting with the kick as well, and once again- with just a SLIGHT enhancement in the perceived 45-55Hz range, it made the kick sound cooler/beefier as well. I can see how plug-ins like this can be easily over-boosted and abused in the hands of someone who doesn't have a good handle on EQ or mixing to begin with, but it's strange to me that no one here (to my knowledge) has mentioned any practical positive use of this type of plug-in. Does anyone here make good, reasonable use of psycho-acoustic bass enhancement, and more importantly, do any pro mixers use them?