Arduino Player Piano New Guts

New hardware and software for Arduino Player Piano (https://www.thingiverse.com/thing:1174721)

Print list:
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See https://www.thingiverse.com/thing:1174721 for STL files


Required Components
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Arduino Nano (You can use a Mini or UNO if you wish however the PCB is designed for a Nano)
12 5mm LEDs
14 10uF/16V low profile capacitors
12 Resistors with correct resistance for your LEDs
2 2N3904 or and other General Purpose NPN switching tran