my perception with zoom (only based use, not actual knowledge of how it works) is that it has two modes: one where it tries to isolate the speaker and auto-mute

my perception with zoom (only based use, not actual knowledge of how it works) is that it has two modes: one where it tries to isolate the speaker and auto-mute everybody else, and another where it can't figure out who the speaker is and just lets all audio through. so if everybody on the call is singing together, it should all come through.