You might also find something useful at http://bit.ly/webrtcwebaudio. PeerJS is a library oriented to data exchange: http://peerjs.com.
If you want a simpler signaling server for WebRTC, you might check out the "caress" server I developed for Chatphrase: http://github.com/chatphrase/caress
[1] http://dev.w3.org/2011/webrtc/editor/webrtc.html
[2] https://bitbucket.org/webrtc/codelab