I didn't even know that YouTube had multi-channel audio. I'll need to check it out sometime.
EDIT: I'm trying out a youtube 5.1 sample on the PC. I never noticed this before.
BOLT(4TB)x2/Roamio Pro (5TB Red)
TiVo Mini x4
Roamio Basic(1TB Red)
53TB unRAID2--41TB unRAID3--35TB unRAID1a