Remember it was initially implemented to support giving lectures to tens of students, who may join late or leave early. Having to teach remotely, let's try to a

Remember it was initially implemented to support giving lectures to tens of students, who may join late or leave early. Having to teach remotely, let's try to at least not reproduce the annoyance of the physical world with the noise of the classroom's door ;-) (I agree that an optional sound would be nice.)