I also recommend Jamulus (https://jamulus.io/ https://jamulus.io/) for really low-latency audio. It got a fair bit of attention and development done during 2020

I also recommend Jamulus (https://jamulus.io/ https://jamulus.io/) for really low-latency audio. It got a fair bit of attention and development done during 2020 and now works better than ever. I regularly stumbled upon open jamulus rooms which some music teachers used for their private lessons. They usually spend a lot of time (painfully so) explaining the students how to connect everything and use Zoom simultaneously for video.