One special feature of the Raspberry Pi is its GPIO, or General Purpose Input/Output connector. This is the strip of pins that runs along one side of the Pi, which acts as a connector to a number of physical inputs or outputs.
It is this This ability to wire up custom physical inputs, i.e. switches or buttons, that is part of the reason Box Of Stops was written for the Raspberry Pi. Perfect for a bit of DIY organ building.
== Setting up a Gpio input ==