Good info. I don't do it unless I have to but there are times when it's necessary - and then I'll go back and gain change it down -3. I got that advice from someone on here - sorry don't remember who now - but it does seem to hit the sweet spot that way when I have to do it on a track in a mix.

I haven't mastered and burned my own cd so I don't know if it's necessary in that context or not.