[LAD] strategies for mixing streams of differing channel counts

Could I get some ideas and advice on the subject of reconciling two streams with different channel layouts? Going from mono to stereo is straightforward: make a stereo stream with both channels carrying the same data. Mixing a one or two channel stream with 5.1 or 7.1 also seems fairly clear: the audio goes to the front left and right channels. Is this line of thinking solid? What I don't understand is how to reconcile 5.1 audio with 7.1? Which two of the four side and rear channels of 7.1 should receive the two rear channels of 5.1? Also, should mono streams be mapped to the center channel of 5.1/7.1? I understand that the chances of someone writing a game that would go beyond stereo are rather slim, but I'd rather not risk having someone write a game that won't run on other Z-machines, but not mine. I'm also considering extending the results of my work into a general-purpose mixer library. -- David Griffith dave(a)661.org A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?