I made this presentation to the Concord Band on June 15, 2020 and posted the recording+slides+links at the link below. The context was that I had helped 5 band members do a virtual brass quintet video, and they wanted to learn how to do it. I recommended a lot of much simpler alternatives first, then demonstrated how to organize a virtual ensemble project.
http://thedenneys.org/pub/music/technology-for-playing-together-remotely-20200615/
This covers ways for instrumental musicians to play together safely, in person and remotely. We talked about Zoom and what DOES work, applications such as JamKazam and Soundtrap that are designed for musicians, then went deep into how to organize and produce a virtual choir or virtual ensemble project. I emphasized that a virtual ensemble video is a very technology-intensive project, and there are many simpler alternatives that allow you to spend more of your time actually playing music.