Uncompressed audio needs the least amount of computing power, having to compress it is more CPU intensive..
FMOD, the quite infamous audio middleware did a press release on how they are working with MS and the SHAPE processor..
http://www.develop-online.net/news/44302/FMOD-Studio-optimised-for-Xbox-One
It's not some amazing golden bullet for sure, but it's sounding like (pun intended) it's a step up from anything used before on consoles..
Of course, the PS4 may have something awesome, but no ones come forward with it yet...
What's funny is the whole rebuttle in this thread about people bringing up audio.. which is ironic considering the thread title.. One definition of balance just could be to put processing resource where it's needed in all areas of the console.. shocking revelation that will no doubt be shot down..
Everyone knows, admits, and is OK with the PS4 being the GPU raw powerhouse that is also designed to be very efficient.. that doesn't mean that MS calling their system 'balanced' is some heinous attack on Sony that needs instant berating and pedantic chastisement of what is normal marketing spin..