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That's quite neat,
is the transistor for software shutdowns?It is. I could use the 5v to Pi to also switch a MOSFET powering the amplifier.But just any momentary switch would also do the trick I believe: https://raspberrypi.stackexchange.com/questions/77905/raspberry-pi-3-model-b-dtoverlay-gpio-shutdown
Tijmen
[Edit] had wrong image
[Edit2] here's the link, in case it was useful
https://lowpowerlab.com/wp-content/uploads/2016/12/ATXRaspi_GPIO_software_shutdown.png
How about a momentary switch soldered to the headers on the pi.
I'm trying to find a link i have saved that shows how to do it