Play audio files simultaneously ?

and I know with Quicktime Pro you can view multiple clips at once, which would be perfect, but you can only play one audio at a time.

If you are referring to QT 7 here, then go to the Preferences window and deselect the "Sound: > Play sound in frontmost player only" to allow simultaneous audio playback from multiple movie players.

I was actually referencing your video, in which you deleted all of the audio except for one. If all your movies had different audios, had you not deleted it would they have all played simultaneously?

Thanks for posting the link so I would know to which movie you were referring. Answer above assumed you were trying to play multiple movies in separate players simultaneously. In this case, where I placed several, differetnly compressed video tracks in a single player, I did only use a single audio track since they were all the same AIFF (Linear PCM) content and I wanted to save what little file space I could for online viewing purposes. To answer your question, yes, if multiple audio trackes are layered to the same player over the same time interval and all of these tracks are activated (simultaneously checked for playback) then all of the tracks will play simultaneously.

Here is an "S&G" example of a file in which selected segments of the audio and video content from one movie are layered over the audio and video of another movie for simultaneous "picture-in-picture" playback as requested by another QT forum user. SAMPLE 012

There is also a third interactive, multiple audio/video track option in which the viewer can switch between the display of individual video tracks in the same player display area while either playing all of audio tracks simultaneously or only playing the audio associated with the currently displayed video track. While this is emplimented relatively easily using QT Pro, the switching of playback content is not always all the smooth and the file size overhead can quickly maunt up. Still, it might be an interesting effect if you are playing all of the various instruments and doing all of the vocal parts. Biggest proble would likely be the synchronization of all the content of the various tracks. The hook here, of course, is the fact that the viewer can, at his or her whim, cycle through the various tracks unlike cutting and pasting various track segments in a fixed playback order. Oh, well, just some more "food for thought" for the creative QT Pro users.