Thanks a lot for that advice, Moth3r.

So I started up BeSweet and muxed my six mono WAV files into a single 5.1 WAV file. So far so good.

Then, I found out that it seems BeSweet can't downmix a 5.1 WAV to a matrixed stereo WAV. Apparently it has to be an AC3 track?

All I want to do is get a PCM stereo track that can be decoded into surround- I don't want to convert it to AC3 at any point in the process and lose quality. Do you know if there's any way that this could be done?

Thanks so much!