Terrible sound + buzzing noise on jitsi meet: any ideas?

I am new to Jitsi. I connected to a Jitsi meeting earlier on my Lenovo laptop, using google chrome browser. Link worked fine. Video was fine, but sound was terrible: extremely muffled, with buzzing noises. I tried reloading a few times. No luck. There were 8 of us in the conference. Most are from Europe; I’m the only one in the U.S.