No audio....

I use iPad to connect PC RDP. But I cannot hear audio.
I had checked the audio setting. It showed Microsoft RDP audio drive but mute and volume set to lowest.
Then I tried to uncheck the mute and max the volume, but it failed when apply was click. Setting was go back to mute.

I try to install MS's hotfix (http://support.microsoft.com/?kbid=818465) but it didn't work.

Is there any other solution?

Tyler