This is all very good news. I just bought the 34" HP Envy, and it is a beautiful machine, but the sound of my violin was cutting out during my Zoom lessons. After seeing Erop and Paul's conversation, I looked for an app and found that there was a Bang & Olufsen app on my machine. I turned off all noise cancellation on the app for all of my microphones and then tested them on Zoom. Now my sound is completely back. Then I set the equalizer for music. Probably don't need that for violin because it basically raises the bass, but maybe I'll take up bass guitar now. Now I think I'll set everything else back to default and see if it still sounds good.
Many thanks to both of you for solving this problem for me.