Enable MacOS Start Up sound in the new 2016 and 2017 Macbook pro

Disable boot on power source and boot on lid open by running this on terminal:

sudo nvram AutoBoot=


Enable it again by running

sudo nvram AutoBoot=%03


Feature removed by apple on latest firmware, doesn't work anymore.
Bonus: Boot chime control
sudo nvram BootAudio=
sudo nvram BootAudio=%01

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