I've created a comprehensive tutorial on how to install & configure Mumble audio chat client and how to use it to connect to Occupytalk.org's murmur server. Find it here http://dev3.banghousestudios.com/content/how-install-mumble-123-mac-configure-audio-settings-optimal-performance-connect-occupy-wall on my dev site. Any questions? Ping me @banghouse on IRC. It's my hope that we will all be able to get it setup on our own and connect in the OWSNYC channel on Thursday for our regular scrum call.