Alright, I figured it out. Before I was trying to import a AIFF directly from sound track pro into the audio tab in motion. From there, I was dragging it onto the timeline as a layer. For some reason this didn't work.
So, instead I exported the original audio from FCP as a quick time conversion AIFF. I imported it into my "media" tab, and then dragged it into the small, horizontal bar that extends out from the various tabs, overlooking the time line (Sorry I don't remember what that bar is called".
Now it stays there. So, problem solved! Thanks!
"A man that does not reply to his own thread after receiving help truly sucketh."