I've answered hundreds of them and compiled the most popular questions in a downloadable searchable 200-page collection of answers. From finding the right codecs to play your movies, to converting files to new formats, this guide steps you through solutions to dozens of audio and video problems. Think of this as the ultimate painkiller for your personal digital video and audio headaches.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwmt/html/WMA9_Multichannel.asp
"Learn about the multichannel and dynamic range control features of the Windows Media Audio 9 Professional codec and how the codec transforms multichannel audio content into stereo audio content when necessary. This article shows how a programmer using the Windows Media Format SDK can create an encoding application that enables a content author to determine how that transformation happens."
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