Here is a player piano video of a 70’s vintage Duo/Art playing along. While it needs tunings, some cleaning and a little TLC, everything seems to be working. About mid way I adjusted the tempo to where it was supposed to be so that is why you hear it slow down. Good views of the striker (for the keys) pneumatics in action. If you watch carefully at the vacuum regulator, the long black box, you can see it moving.

Click on the link below for the video:

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For the video on my YouTube channel click https://youtu.be/DtPu_gG06Tg