Hi Vicki,
We tried every setting we could find and nothing improved it much. I thought that if my mic and guitar went into an audio interface and out via zoom, that would work but it didn't improve things.
My musical partner, Neil, plays an Alesis Strike electronic drumkit. We took the output to both his speakers and a Behringer mixer. We took the output of the mixer and put that out via zoom. The sound was really good, success! Until we turned the speakers off and realised that the Behringer had nothing to do with it. The mic an a cheap external webcam was picking the sounds up and putting it out to zoom.
So I could hear him well but he couldn't hear my guitar very well so we couldn't jam but we were able to go through song parts together.
So sorry, no real help!