Exporting your work?

Wow, second post in one day. Ok so me and my band recorded 3 new songs on the G's sequencer, but we have no idea how to export our music to a PC. The reason for this is so we can upload our music to our myspace profile and possibly make a CD as well. I've also noticed that the songs are not in MP3 format by default, but SMF, or something along those lines. To make a long story short, how can I save my work on my PC and convert my songs to MP3's? Help a newbie out? Any help would be appreciated. Thanks guys