You can specify additional RDP settings, such as audio redirection, that cannot be specified on the other tabs. These RDP ...

You can specify additional RDP settings, such as audio redirection, that cannot be specified on the other tabs.  These RDP settings will be used when a user connects remotely to the terminal server.    To specify custom RDP settings, type the RDP settings into the Custom RDP settings box.  You can also copy the desired RDP settings from an existing .rdp file by using Notepad.