Your idea works great for different surround settings (which is what I first thought rmcard might be thinking of), but I don't think it'll work for small/large settings. At least I didn't see a way for it to work last night when I tinkered with the settings.

It's not a perfect solution, but what about leaving the mains set to "large" all the time? Using zacster's input trick, you could have the CD input set up for stereo and with the mains set to large there wouldn't be any info sent to the sub (I think). The mains would be still be "large" when you watch DVD's, but I don't think the sub will be active on music. Can anybody see a flaw in my reasoning?

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Gonk