The Aeolian Company introduced a piano-teaching device called the
Visuola in the late 1920's.  It worked by having tiny electric bulbs
light up at the rear of any key that was being played by the piano roll.
In this way the students could know where to place their fingers.  I am
trying to collect any and all information about this device.  Has anyone
out there ever seen one?  Does anyone have any rolls or literature
associated with the Visuola?

Thanks in advance,
Randolph Herr