Seperate audio streams?

[trav1085]

I'm new to VideoStudio 10, and am wondering if it is possible to have each separate audio clip as a different stream. I have the clip that came already on my video (captured with VirtualDub) and then I recorded some commentary, but when I save the video file, there is only one stream shown in Media Player Classic.

Is there another program that does this? I don't want to have commentary on the entire time, just if I want it.