Carlo Celuque
I need to give to the students all the audio tracks we have recorded so they will try to create a mix in another DAW they have like Audacity or Ardour.
That's a very important piece of information. I don't know if they import Broadcast WAV files at the proper times. In that case you probably have to start each file you want to export from the beginning of the song to insure they stay in sync.
If you're concerned about hard disk space, you could export as MP3, Ogg Vorbis, or any other data compressed format the other DAW will accept. A long section of silence takes up very little memory with data compression.