I have three PiCorePlayers, two Logitech Boom players and two Logitech
Radios all working from a Squeezeplug running on a Raspberry Pi B.  One
of the PiCorePlayers is connected to a 2 x 300Watt (RMS into 8 Ohms)
amplifier that runs my single zone whole house sound system.  This whole
system is in the (well ventilated) top of a closet.  

I switch it on and off via the Android Squeezebox app.  I built a little
bit of electronics that senses sound coming out of the Pi + Behringer
UCA-222 USB interface.  Once it senses a signal, it operates a mains
relay that turns on the amp.  It stays on until about 2 minutes after
the signal stops.

So far it has been very reliable.  However it would be very nice if a
Raspberry PI GPIO pin could change state when the PiCorePlayer (the Pi
is always powered on and ready) is switched on via the Android app. 
This is analogous to powering on a Boom via the same app and seeing the
screen light up.

If I could use this positive On/Off signal to activate my relay then I
could dispense with my signal sensor.  Why?  Mrs. rederikus sometimes
turns the things down so low that if it is activated later with a quiet
piece of music then, sometimes it does not activate.  Mrs. rederikus
then complains to me that it does not work.  OK, I could always play
only very loud music but, I like Pink Floyd a lot and some bits are just
quiet.

If anybody knows of a GPIO pin that toggles when PiCorePlayer is
activated (not powered up) I would be most grateful.

Thanks in advance.


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