Microphone Playback in SoundMax

Modify the registry key, it will look slightly different in other computer, just look for identical key. In my Laptop, HP 6530b the key is:

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4D36E96C-E325-11CE-BFC1-08002BE10318}\0005\AD1984A\Disable]
"MicBR"=hex:00
"MicV"=hex:01

I changed it to
[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4D36E96C-E325-11CE-BFC1-08002BE10318}\0005\AD1984A\Disable]
"MicBR"=hex:00
"MicV"=hex:01
"MicS"=hex:00
"MicM"=hex:00
and restart the Laptop.

And now Microphone Playback is working. The option in enabled in volume properties.