This is a typical question that comes up during the beta process. I just realized that chat for Sound Design wasn't really ever set up after it moved to the Stack Exchange 2.0 platform, and I'm here to fix that!
In case you didn't know, we have chat, and it's awesome! Click on the Stack Exchange icon at the top left of your screen while browsing Sound Design and then click the chat link - you'll go to a page full of chat rooms associated with the site.
I've created a generic chat room for you - but the name and description is quite bland and boring. We can do better, so let's use this post to come up with a better name for chat.
For instance, our site for Aviation named their room "The Hangar", our site for pets named their room "The Litterbox". The name can be creative and a little funny, but should remain obvious to someone new that this is the room to come and chat about sound.
Have fun, and may the best name win!
Update
The echo chamber is now available for chat! Enjoy! Don't forget, you can create additional rooms as you like, we only ask that they relate to the topic of the site (sound design, or topics closely surrounding it).