From the home page of sound jack site (https://www.ianhowellcountertenor.com/soundjack-real-time-on...):

> In practice, musicians ignore sound and watch a conductor when separated by such distances [of 100 feet].

It had never occurred to me that a conductor was a kind of clock at an approximately uniform distance from the performers.

Uniform distance matters little for a conductor. Performers watch visual cues from him and speed of light is very fast (unlike sound).

If you are 100 meters away, you have delay of about a third of a second if you use sound, but for light it will be a fraction of a millisecond.

> Uniform distance matters little for a conductor. Performers watch visual cues from him and speed of light is very fast (unlike sound).

Doesn't matter for the performers, but it matters for the conductor.

Conductor is the metronome.

This, I've asked my musician friends too how teaching has been like through covid. All the platforms for recording they stated have at least a 0.5s delay, which makes playing together with a student very difficult. Usually the teacher sometimes has to prerecord a sequence instead and play a video, which makes teaching online not really convenient or fun for the teacher.

That's a great guide! Thanks for sharing. Much more what I would have expected from the parent link :)