Joe Bfstplk
Axe-Master
Connect the metronome output to a SS power amp, and the speaker out to an automobile ignition coil, and connect that to electrodes on the drum stool....Set Metronome level for one of your outputs. Send that to the drummer as audio.
No way to send him a visual indicator with the Axe Fx as the master time keeper.
In all seriousness, you could probably strobe a neon bulb with a filament transformer and diode in place of the ignition coil....