Slatye: It looks like it might be possible in some cases, but not in a general, portable way. Windows seems to give you the option of specifying which channels to use, which would allow you to play on only the rear channels, while programs would normally request only the stereo (front) channels. At the same time, if Windows was configured for 2 speakers, it would copy the front to the rear, defeating the purpose, so people would have to configure their computer appropriately. SDL has support for surround sound, but it doesn't allow using only a subset of channels. I suppose Peachy could just avoid playing on the front channels, though there's still no way to ensure another program isn't writing to those rear channels).

Honestly though, this is much ado about nothing. Expect that the Peachy will require the dedicated attention of the sound card while it is printing. If that's a problem for you, I recommend buying a cheap USB sound card.