Adding The Startup Chime Back
Apple removed the start up chime on the USB-C era and beyond Macs. That warm friendly iconic sound can be added back with a simple terminal command
sudo nvram StartupMute=%00
Entering sudo at the start of the command, will ask for the administrators password to allow the command to run.
Switching the %00 to %01 turns the chime on and off.
%00 - Chime On
%01 - Chime Off