Select the clip in the project window, then choose Clip on the Menu bar>Audio Options>Breakout to mono clips. You now have 3 .avi files in the bin instead of one. Add another Mono track to the timeline. The clunky part is that you will need to drag each of the 3 clips to their respective track (instead of one drag or a multiple drag where they drop kinda crazy). Lastly, lasso the 3 clips in the timeline and right click on that selection and choose “Group”.