SILVERSLEEVES I know with burning to CDs:
DragonBurn still, as I have it "ironed in" to my prefs, runs its volume balancer on files "treated" with this software. In any other respect, DB4.x is Ok with the integrity of the files as MP3. Toast 6, however, tends to want to decompress the MP3s if I process them under Album Gain with no target dB. T6T is fine with Radio Gain-balanced files however. I just recently installed Toast 7, but haven't seen if the same quirk persists.
Altogether a nice product. I remember using both an earlier version and its Windows twin, and this one, though the GUI isn't as fancy, impresses me more than both with its stability and effectiveness. It's certainly easier and more fool- and user-proof than running Normalize-MP3 in the CLI.
Silversleeves
(Version 1.9)