Transmitting wirelessly using AirPlay to Apple Express under Piano...
This is AirPort Express under Piano works as wireless reciever. Can be configured as its own network, or part of your home network.
IQ Control Box under Piano
AirPort Express and the iQ Control Box are under the piano.
Back of AirPort Express
Don't use these audio outputs.
Install box right there! Inset about 1/2" so that the knobs are flush with the front of the piano. That way they won't stick out to far and accidentally get damaged. Of course it looks better if it's back a bit as well.