I really dislike fuzzy/tinny audio. Sometimes RDP connections with RDC clients results in laggy and/or poor quality audio. A two step tip that you can use to try and solve these problem in Windows7:
#1 on the server (the machine you are connecting to)
Using the Group Policy editor, Go to Computer Configuration:Administrative Templates:Windows Components: Remote Desktop Session Host:Device and Resource Redirection. Set “Limit audio playback quality.” to “Enabled,” and set “Audio Quality” option “to High”.
#2 on the client (the machine you are connecting FROM) save and edit the RDP file for the connection and add set audioqualitymode:i:2 to the file (you can use Notepad or a similar text editor to do this)