When you want to listen voice commentary you need to be sure you use new web version of BBO. This is the link: https://www.bridgebase.com use a modern internet browser (Chrome, Safari, Firefox, etc.)
When you join a table if there are voice commentators you will see the voice button in yellow
To listening the commentators just click on voice button and click Start listening.
Here is a link with more details and also a printscreen:
