Gary Rosenzweig, author of ActionScript 3.0 Game Programming University, shows you how to pause a sound in AS3 by recording the position of the sound before stopping it, then resuming the sound at that same position.
Flash Game University Podcast is an audio and video podcast about Flash Game development and the book "ActionScript 3.0 Game Development University" by Gary Rosenzweig. Check out http://flashgameu.com for more information.