Not helpful, attach all updated problem reporting files.
OK, all requested files attached here, clean formatted install
to recap for those following this thread;
no sound output on any rear motherboard ports
sound only possible through USB adapter
10.10.3, X79-UP4, BIOS F7, i7 3930K, ASUS GTX770
Multibeast 7.3
audio tested via mp3 playback on iTunes, green, orange and black motherboard ports
via SysPrefsSound settings respectively Internal Speakers, Line Out (1st), Line Out (2nd) - no sound
success is only achieved via USB adapter (see earlier posts)