I use an excellent videosurveillance Windows app named Blue Iris that saves audio/video from 4 USB webcams + 1 IP cam. All the 5 cams have integrated microphones. For the IP cam, the app receives and saves audio via IP camera stream. For the 4 USB webcams, Blue Iris receives and saves audio via "DirectShow".
Connecting to this PC via Remote Desktop (RDP8) works wonderfully with 15-30fps full color videos but there's a problem: while I'm connected all the DirectShow capture devices DISAPPEAR (supposedly replaced by the remote virtual audio device) and therefore no audio can be listened nor saved for these USB webcams.
I tried all the play/recording settings combinations on the RDP client without being able to keep those DirectShow capture devices. Do you know a solution to keep them?
Here http://www13.picfront.org/token/iJrU/2012/12/22/2121473.jpg is a screenshot that shows the 2 situations: while RDP now connected and while RDP connected.
Note: TeamViewer doesn't have this problem but it shows only 1-3 fps :( so I use RDP8 because it's 10x better!