Sound Problem

I, too, am experiencing this problem in exactly the same use case. I am wanting to participate in Zoom sessions where morse code will be taught, so it is important that the audio of the morse code I am generating on my desktop (though the speaker of a transceiver) is audible to other participants. I find, when I record my own meeting, that the morse is audible quite clearly for up to a second, but is then so severely attenuated as to be almost inaudible, and this happens regardless of which audio profile I use (I have tried them all, and have also tried turning off auto audio volume, to no avail).