Once you have both proxies running and connected to each other as I outlined earlier, goto the Sound System menu on your local proxy. Turn on some of the options, as I have done below. You can also play around with the advanced options under the Settings menu. Now goto the QTV proxy, and enter the Voice Channels menu. Turn on the Autodrop Rate if you are on a modem.
Channels can also be password protected, for private chatting.
Once you are on a voice channel, goto the Bind option and bind a key for each channel you are on. Holding down that key while you talk into your microphone will send your message to the other users on that channel. Fire up Winamp 2.0 or higher, and goto the Misc menu option. You should be able to hear the MP3, Quake sounds, and voice channels all at the same time. You can also play around with the Compatibility Mode .