Hey there angrymomxmarebeli,
We'd like to help get that buzzing sound to stop in the left speaker for your Mac.
You mentioned recently updating, and we see you're using macOS 11.2. The latest version is macOS 11.2.3. You can verify the version number installed by clicking on the Apple logo at the top left corner of the screen, then on ‘About This Mac’. Here's how to first Back up your Mac with Time Machine, and afterwards, here's How to update the software on your Mac.
While this isn't the exact issue you're having, we still recommend taking the steps in this second link: If the internal speakers on your Mac aren't working
Take care!