With thanks to everyone for giving it a shot.
Lag time is a factor for remote interaction
Sender to listener and back again is a round trip, it's gotta go through processing and sending.
Plus, the speed of light is fast but it's not 'instant' Only apparently instant over short distances.
Multiply those small fractions of a second for information to travel, by multiple sources spread out over Sydney, add it all up and... it spooks the musicians.
We've tried remote songwriting (possible but need more gear) and we've tried remote rehearsal, and have not sorted it.
We have another couple of tests to do to see if we can't shave off a millisecond here or there.