i am trying to do the same thing, in 5.0. the suggestion here does work, however it creates a totally new copy of the video clip as well. I have 5 seperate tracks for a single video, and would like to use buttons from the menu to set the tracks. All I can find is to make seperate video buttons, and then choose which audio track to start with in the button properties. However this also creates a seperate copy of the video track, taking up a lot of space. Anyone know how to make a button that just changes the audio track, but still links back to the same video file?