Hello Richard. Well I re-read my question and its not so clear. So here it is again. I'm 17iMac w/512ram &X.2.3 with iMovie3. When I export one particular iMovie Project QuickTime, it plays the video in QT but not the sound. The same Project plays back fine in iMovie. Investigating the problem, I Exported another iMovie Project to QT, and it plays normally, both sound and video. Investigating further, I made a new Project in iMovie using one of the problem soundtracks. It Exported to QT and plays back fine. Any ideas why one particular Project should export silent? What do you mean by "playing from the timeline"? I need to get a QT movie. Regards, Winston