Anderton:
I'm so happy to hear you say that about MP3 "coloring" the audio!
This is probably a comment on the (questionable) quality of my mastering, but I perceive that my master mixes sound better when I convert them to MP3, fixed at 192k bps. It seems to "warm them up". I've silently been noticing that about my master mixes and your post seems to reinforce my perception.
Using the AL on the Master bus, I'll now be able to "preview" my mixes without exporting them.
I like that a lot!
Paul