Therefore, the piano has 96 keys and only sounds one octave. I am able to use any multiple of this 16th-of-tone chromatic "scale". Thus, I can use ET [equal temperament], or approximate any just tuning and modulate between them at will. It represents total "tuning" freedom.
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You can check out more of John's work at his ReverbNation page, CDBaby store, blog, or Facebook Page.
Update: John also sent along the link to Bruce Mather's Double CD of the Hot Tempered Clavier and more microtonal piano works.
Update: John also notes that the embedded file is only an excerpt. You have to buy the CD if you want to hear the whole thing...