Hey,
I was thinking of using the usb power signal to know when the tv is on so hyperbian knows when to start outputting the led signal, and also i thought of using an output signal to control a relay to power on the ledstrip.
My setup is psu powering the rpi4 and the ledstrip, my tv now controles the relay for powering on the ledstrip. RPI always on, so if the rpi knows when the tv is on, it can start with the startup sequence of the lights. Maybe configurable gpio pins in the configpage, could be that someone is using those pins for something else.
Grtz Dirk