We’ve got a digital / virtual one here now, on the sidebar above the MESSAGES:
This is experimental, but seems to work okay. Is a simple voice chat which can accommodate up to 10 people.
How to use it
Simply click on the 
on the sidebar. Your avatar will appear there, as well as anyone else who might be there:
When you use it for the first time on a device (it works on mobile and desktop), you’ll need to grant it permission to use your microphone.