Also, according to this page:
https://www.hifiberry.com/docs/hardware/gpio-usage-of-hifiberry-boards/
GPIO 3 (pin 5) is used by the amp "for configuration". I believe GPIO 3 is the only pin that allows you to power ON the Pi (i know you can reassign power OFF). Can I still use GPIO 3 to turn the pi on and power it down? If not, do I have any other options for turn on a powered down pi via switch other than killing the power to it?
