[soylentcola]

I mostly use Zoom and Webex, but both have an option (usually accessed via a little arrow next to the mute button) to open settings. Both give you the option to choose which mic/speakers you want to use and both allow you to do a test record for a few seconds and then have it played back to you.

I know in Webex you get this option before you are connected to the actual meeting, but Zoom may have it somewhere else I haven't bothered to look for. I make a habit of testing my mic every time I connect to a meeting, just in case I mucked something up or there's some other issue I wouldn't have known about. It's a minute of checking to save several minutes of embarrassment and delay later on.