My proposal is to add ability to invoke flashing in FOH desk from MON desk (and vice versa) whenever desk are linked.
This should go as following: pressing SoftKey in monitor desk should activate blinking light in front desk SoftKey
to notify that there’s something that monitor engineer needs to inform FOH engineer through talkback (and vice versa).
I’m not sure if there’s MIDI or some other data than audio flowing between SLink connected desks, that could carry the messaging,
but even if not there should be possibility to do this using pilot signal (i.e. 30kHz sine to trigger alarm) in channels that
engineers have already dedicated for talkback.
The MixExtIn functionality is quite good in handling this problem but it works only when you have headphones on.
This kind of beacon/alarm system could handle the blind spots of that.
Because this something engineers need to invent time and time again, having that onboard would make Allen&Heath mixers even better.