One of the things Mike Wisnewske KC0TAF showed us was the "hiding places" Windows puts settings that can affect VARA FM.
When I checked one of my under performing stations - sure enough I found AGC (auto gain control) on the mic in enabled!
Since YouTube is often our friend in these situations, I found a short video that gets to the point and shows you where to look.
One of the other things they mention is making the PC speakers and mic the default. I wasn't able to do that always.
I might add that with my mini PC there is no native microphone and Digirig is the only default device option, so I left it.
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Mike N0QBH
N0QBH Mike Berg