The chatroom is located on Echo34 (irc.Echo34.net) #bassdrive and is accessible via any mIRC client.
You can also join the chat from bassdrive.com via the embedded java client by clicking here.
In order to chat, you will need to register your nickname. To do that, once you are logged in, type this: /msg nickserv register yourpassword youremail
If that is successful, type this: /hop
You should now be able to chat. If you have trouble, contact me on AIM (parallaxbass) and I can help. Sorry for the inconvenience.