Apple has released a build of QuickTime 7.6 to some of its developer community this week. Downloads of QuickTime 7.6 are available for Windows, Mac OS X Tiger and Leopard.
The builds reportedly deliver improvements in multi-channel encoded audio tracks, in addition developers have been asked to focus on MPEG-1 playback and conversions, as well as encoding and playback of audio tracks in the AAC and Apple Lossless formats.