To stream audio, you first need to install ConnexMe TV on the presentation computer (article here). You also need to have a microphone connected to that computer. 

Once you have ConnexMe TV running, go to your meeting in ConnexMe on the Interact page and click on the Remote Control button

Scroll down on the Remote Control page until you see the Capture option, and click on the microphone icon

The icon will turn red, meaning that it's capturing and streaming audio.

If you go back to the Interact page you will see a speaker icon just above the slides

Simply tap it and it will play the sound live