It is really important that you know how to operate the audio devices and mixer if you are assigned to this role. This is critical not only for the video streaming and recording but also for the talk itself, since the mixer controls all the audio input/output of the room.

The channels on the mixer are labelled, indicating to what device each one corresponds. The common audio inputs are the wireless and headset mics, the speaker computer and the ambient mics (to get the room sound).

As outputs, we have the streaming/recording and the speakers, which are controlled by sliders on the right side of the mixer. The "mute" button for each channel is related to the speakers level, it does not interfere with the streaming/recording.

If you get any red lights on the level meters, it means that you have a distortion and you should lower the volume for that channel.

The headset and wireless microphones use 9v batteries, so make sure that you don't run out of batteries. These usually need replacing once a day to once ever second day.

Pay attention on how the speaker positions the headset mic and give him instructions if needed. It should be placed on the same level of his mouth, not to far away that it gets the speakers output and not so close that it gets the speaker breath.