One is played by someone (other than myself) gifted enough to play endlessly and effortlessly making those who listen feel envious.

The next type is played automatically through the use of a paper roll and a sophisticated  player system that uses air to activate the keys.

The third type is digital.  It uses a "computer_like" device to activate the electronic mechanism that plays the keys.  Early versions of digital players utilized a cassette deck, progressed past floppies and CD's, and now work with iPods.

I'm afraid the air or pneumatic type has seen its time come and go.  I haven't had to rebuild one of these for over 10 years.  It's quite expensive and the last of the great suppliers of parts and materials closed in December of 2008.

Starting around 1980, I've installed over 400 of the digital players, mostly PianoDisc.  I have made jigs, racks and other special tools to facilitate a trouble free installation of these players making the end result quite reliable.  For the first 100 or so I provided free service, including the in home tuning, because I wanted to see where my installations needed to be improved.  A good installation is the key to years of "trouble_free" enjoyment.