To make sure that your audio works when using AVID and Zoom make sure that those are the only two applications running.
Close all digital music and video services like Spotify and YouTube.
Setup you audio output
>Go to System Preferences
|Click on Sound|
|Choose Internal Speakers or|
If you have headphones connected
Then check the box for
Show volume in menu bar
Now if you get muted in the zoom meeting
go to the upper right of the screen and choose the
you will see how the audio is routed out of the computer
and also if your volume slider is turned all the way down