[Hardlec23]

MS has a metronome

Open a song
tap bottom right
select metronome icon (left side)
Adjust the parameters to suit

I tend to use Leds for the display (on metronome dialog. tap 2nd item from top left, set offset to -35 to push it to edge of page)

Geoff

This is a great suggestion. 

The idea of a flashing light has been made by members, so as not to distract from the music with "clicks" but I don't know how to make this so the whole ensemble can see it. 
Any advice on color selection would be good, also.