Movie audio questions?

[xxDarrenx]

Hello, I'm trying to create a music video for a school project. I don't know how to mute certain audio clips in a video (I told them they could talk and I could remove it) or how to take the audio from one clip and play it through the whole movie (the singing). I can use any free software as long as it is not a giant download. Whichever you use and you can explain to me is fine. Thanks and sorry if this was confusing!

[Baldrick]

Tried any free editor like windows movie maker, etc? Like http://www.dummies.com/how-to/content/how-to-add-sound-to-a-movie-using-windows-live-mov.html

If you don't need to any editing so the audio matches the video can you use a multiplexer. You can both demux audio to edit it in goldwave and then mux it back to the audio file. https://www.videohelp.com/tools/sections/video-de-multiplexers