Hello,

To render your file in various audio formats, click the Audio button in the main toolbar. The file will be saved by default in the Song Renders folder (in your Band-in-a-Box folder). If you need a compressed format but don't need it to be mp3 specifically, you could render it as an .m4a file. If you need it to be mp3, then you should render as an uncompressed audio file (AIFF). You'll then use a third party program to convert this to mp3. I'm not sure if current versions of Apple's software like iTunes, Quicktime etc. can encode MP3's, but you should be able to find out with a couple google searches.

Andrew
PG Music Inc.