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To test your lighted piston keyboard, there are two main things that need to happen:

1) Enable lighted piston functionality on the keyboard.

• press and hold the set piston (far left) for that keyboard
• press the last black key on the right (A#5)
• press the 13th black key from the left (F#3)
• release the set piston

2) Put the keyboard into lighted piston test mode

• Press and hold piston 19 & 20 simultaneously to enter test mode.
• All the pistons should light up for 2 seconds then they will go off.
• You should be able to press any piston and it will light up. Press it again to turn it off. 
• Press and hold piston 19 & 20 simultaneously to exit test mode.