Audio considerations for virtual meetings

Sometimes I'm hired for audio support for big virtual meetings or presentations.  (see a photo from my last virtual meeting job above)  I wanted to take this opportunity to share a couple of considerations when you're working on these jobs:

TLDR: Make sure you're broadcasting all media for an online presentation to a virtual meeting from only ONE device (computer, tablet, etc).
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It's important that you're sending the audio for the presentation out to the virtual meeting on the same computer and same the "user" or "account" that is logged into the meeting that will also be used to broadcast the video for the presentation.  This may seem obvious, but for some, it can be easy to get confused on this point.  AV technicians who are used to hardware audio and video mixers may be used to a level of flexibility with patching and routing things that just doesn't work in a virtual meeting.  For instance, you would NOT want to try to send the VIDEO out to a virtual meeting on one device / account, and then send the AUDIO for the presentation to the virtual meeting using a second device / account.  While both the audio and the video would arrive in the meeting at pretty much the same time and roughly in sync, the incoming audio would trigger the AUDIO account to be the active speaker in the meeting and the VIDEO account would be minimized in the meeting.  The other possible problem that could occur is that because the presentation was arriving to the meeting on two separate accounts, this would defeat the meeting software's ability to mute the microphones of the people receiving audio.  This can cause a lot of problems with echo in the meeting.