Hi, I've got a cassette that I recorded today of a puppet show that a local library is going to put on for young children. I've copied the play to my hard drive as a wav file using CDex, and will put this onto cd for them as they have to do this play several times and thought it would be easier just to play the cd each time. One thing they want me to do is mix a song in towards the end of this wav file... so when there are 20 seconds left in the show (the puppets are supposed to be dancing - lol) I need to mix this song in (low volume) for the puppets to dance to, then after the 20 seconds (the show is done) I'll be raising the volume up (I've already gotten this done as a second wav file). Is there a program I can use that will mix these files together like this without screwing both of them up? Thanks in advance (and I hope I explained it well enough to make sense), Will