"the music goes in here and goes around and around" and around and around and around............................lol

In acid if you make your loop too be one measure long and render to a high quality MP3, or master a .wav in sound forge or wavelab or t-racks, import the master back into acid you can then render a really high quality MP3 or use one of the above mastering programs to make a .wav loop. From my point of view the .wav is going to be too large a file size, especialy when learning to make loops.

Anyway a one measure(or less) bit-o-music will auto loop in acid when rendered to an mp3.