I have a Mumble voice server I use for Mac gamers. Me and my friends are regularly on playing Black Ops or Borderlands 2 or just hang out. Anyone is welcome to join and participate as long as they aren't jerks :P

Some games have built in voice chat, but its sometimes PTT only which is annoying. Mumble lets you be hands free. Or sometimes it has just badly done voice chat. Mumble is always clear and low latency.

Instructions below.

1. Download the file at http://mumble.sourceforge.net. Mount the .DMG and drag the Mumble app to your Applications folder.

2. Boot the program, It should ask you run to the Audio Wizard. if not go to Configure-->Audio Wizard and run through all the steps. Make sure you select the right input device for your microphone. If not using your internal microphone select your headset or USB mic. For example mine is "Astro Chat."

3. Go to Server-->Connect. In the menu click on "Add New…" In the bottom left.

4. For each field:

Label - Whatever you want, this is for your own reference, is used in the server list.

Address: Put in: macgamecast.mumbleserverhost.com

Port: Put in: 32438

Username: Whatever you want your username to be. Example I put Wumpus or Ripper.

5. Hit "OK" then click on the server (will be named whatever you put in for Label) and click "Connect" In the bottom right. It should only take a few moments to connect to the server. If it asks you to verify a certificate, click YES. Then try joining a channel like "Lobby."