Backported dummy sound device to 1.0.x branch

darcs-hash:20090414153703-58103-d643902c429e2d1ffe3fe55c02f605eea721bd11
Updated changelog with dummy audio device

darcs-hash:20090414160909-58252-b7de4d9f9f38ed32a07a754ad179c178b8a2b553