Generating MIDI with
A friend explained that on a particular TV show he worked the Talent would hit a large button to open the show.
The button was not actually connected to anything, a runner watching the talent and giving a verbal cue over
talkback, except sometimes the cue was missed.

Could I wire the switch to an Arduino to send a MIDI command to the lighting desk to initiate the lighting sequence
and fire an audio track from the Audio desk ?

Probably I said.... I have worked with MIDI and DMX over the years but never studied the protocol until now.

There are lots of resources online