before the acid tests ...
Elisha Gray Musical Telegraph"(1876)
Vladimir Baranoff Rossiné "Optophonic Piano" (1916)
The Optophonic Piano generated sounds and projected revolving patterns by directing a bright light through a series revolving painted glass disks (painted by Rossiné), filters, mirrors and lenses. The keyboard controlled the combination of the various filters and disks. The variations in opacity of the painted disk and filters were picked up by a photo-electric cell controling the pitch of a single oscillator. The instrument produced a continuous varying tone which, accompanied by the rotating kaleidascopic projections was used by Vladimir Rossiné at exhibitions and public events.
pass the kool-aid Vlad!
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