(corrected as of 02/10/07)

Guys,

I've got my Soundmax ADI1986A going on my Asus P5VD2-VM!

The key was integrating it with the PCI IRQ of the Microsoft UAA Bus Driver.

To find your ID, simply go to Control Panel > Hardware > Device Manager and look under the Sound and System sections for the relevant hardware:
The device IDs are under the Detail sections, with the first set of numbers as the Device ID, and the second set the Vendor ID as I have shown here:


Soundmax Integrated Digital HD Audio:
Dev ID : 1986
Vendor ID : 11D4

Microsoft UAA Bus Driver for HD Audio
Vendor ID: 1106
Dev ID : 3288


Here's the guide to do it:

In Terminal, type:

sudo su
Enter password (if asked)

1) Delete AppleHDA.kext:
sudo rm -rf /System/Library/Extensions/AppleHDA.kext
sudo rm -rf /System/Library/Extensions.mkext
sudo rm -rf /System/Library/Extensions.kextcache

2) For Intel: cd /System/Library/Extensions/AppleAC97Audio.kext/Contents/PlugIns/AppleAC97AudioIntelICH.kext/Contents

For VIA: cd /System/Library/Extensions/AppleAC97Audio.kext/Contents/PlugIns/AppleAC97AudioVIA.kext/Contents

sudo pico Info.plist

Search for (use hotkey= ctrl + w):
<key>IOPCIPrimaryMatch</key>
change the string to:

If Intel based: <string>0x27d88086</string>

If VIA based: <string>0x32881106</string>

Ctrl+O to save, Ctrl+X to quit

chown -R root:wheel Info.plist
chmod -R 644 Info.plist

3) Edit AppleAzaliaAudio.kext:
In Terminal, type:
sudo pico /System/Library/Extensions/AppleAzaliaAudio.kext/Contents/info.plist
Search for (use hotkey= ctrl + w):
<key>IOHDAudioCodecVendorID</key>
change the string to codec ID:

<string>0x11d41986</string> (corrected this section as of 21/10/07)

Ctrl+O to save, Ctrl+X to quit

chown -R root:wheel Info.plist
chmod -R 644 Info.plist

4) Edit AppleAzaliaController.kext

sudo pico /System/Library/Extensions/AppleAzaliaAudio.kext/Contents/PlugIns/AppleAzaliaController.kext/Contents/Info.plist
Search for (use hotkey= ctrl + w):
<key>IOPCIPrimaryMatch</key>
change the string to:

If Intel based: <string>0x27d88086</string>

If VIA based: <string>0x32881106</string>

Ctrl+O to save, Ctrl+X to quit

chown -R root:wheel Info.plist
chmod -R 644 Info.plist

5) For Soundmax/ADI owners you also need to change the AppleAC97CodecAD198x.kext file >

sudo pico /System/Library/Extensions/AppleAC97Audio.kext/Contents/PlugIns/AppleAC97CodecAD198x.kext/Contents/Info.plist

You need to add ADS78 under <string>IOAC97CodecDevice</string> like this:

<string>IOAC97CodecDevice</string>
<key>PNPVendorID</key>
<string>ADS78 ADS75 ADS74 ADS73 ADS72</string>

Ctrl+O to save, Ctrl+X to quit

chown -R root:wheel Info.plist
chmod -R 644 Info.plist

6) Clean up the system:
In Terminal, type:

cd /System/Library/Extensions/

chown -R root:wheel AppleAzaliaAudio.kext
chmod -R 755 AppleAzaliaAudio.kext
chown -R root:wheel AppleAC97Audio.kext
chmod -R 755 AppleAC97Audio.kext

sudo diskutil repairpermissions /
sudo kextload /System/Library/Extensions/AppleAzaliaAudio.kext
kextcache -k /System/Library/Extensions/

7) Then, reboot!

You should have at least 2 channel sound after rebooting.