Well folks, that's all she wrote. I can confirm now that my HIS 6450 works perfectly with audio as well. Thank you for everyones help. The eventual fix seemed a lot easier than the required learning it took to get there; however, it was a simple connecter type issue with the Pithecia buffer for myself.
Default Buffer:
Personality: Pithecia
ConnectorInfo count in decimal: 3
Disk offset in decimal 500508
0000000 00 04 00 00 04 03 00 00 00 01 00 00 21 03 02 04
0000010 04 00 00 00 14 02 00 00 00 01 00 00 00 00 04 03
0000020 10 00 00 00 10 00 00 00 00 01 00 00 00 00 00 01
0000030
My Bios Decode:
ATOM BIOS Rom:
SubsystemVendorID: 0x1787 SubsystemID: 0x2012
IOBaseAddress: 0x0000
Filename: ST1G01.001
BIOS Bootup Message: CAICOS PRO 1G/64B DDR3 DVI-D/HDMI/VGA 625E/500M
PCI ID: 1002:6779
Connector at index 0
Type [@offset 44245]: HDMI-A (11)
Encoder [@offset 44249]: INTERNAL_UNIPHY1 (0x20)
i2cid [@offset 44319]: 0x93, OSX senseid: 0x4
Connector at index 1
Type [@offset 44255]: DVI-I (2)
Encoder [@offset 44259]: INTERNAL_UNIPHY (0x1e)
i2cid [@offset 44346]: 0x92, OSX senseid: 0x3
Connector at index 2
Type [@offset 44265]: VGA (1)
Encoder [@offset 44269]: INTERNAL_KLDSCP_DAC1 (0x15)
i2cid [@offset 44373]: 0x90, OSX senseid: 0x1
As you can see, the Pithecia buffer lists my first output type incorrectly, should be 00 08 for hdmi. With information from the aforementioned threads, and a little luck, I successfully edited the buffer.
I replaced this:
00 04 00 00 04 03 00 00 00 01 00 00 21 03 02 04
with this:
00 08 00 00 04 02 00 00 00 01 00 00 21 03 02 04
There you have it, made those changes with hex edit, and one reboot later, TA DA... blissful digital audio.
Why all the headache you ask? Well, the no-name radeon buffer that loads with GE=No, gave me great video and audio I thought, just no hardware acceleration. The problems started when I began to notice occasional screen flickers and audio drops. So, hope this does it.