need help in rigging 3ds max

roman33

hi, i need help to create rig for the grand piano action in 3ds max, the example here https://www.youtube.com/watch?v=XArz6uCsrA0

i started to learn animation recently and can not understand the method to do the rig for this.I would be grateful if anyone could tell me how to do it. The max(2014) file is attached