The Gleeman Pentaphonic and especially the Pentaphonic Clear might be one of, if not the rarest consumer synthesizers ever built. Only 30 Pentaphonics and 20 Pentaphonic Clears have ever been sold. It is a five-voice polyphonic analog synthesizer released in 1982, made to compete with Sequential’s Prophet-5, Moog’s Mini- and Polymoog as well as Oberheim’s 4-Voice. The Pentaphonics were designed by the Gleeman Brothers Bob and Al, who equipped them with 3 DCO’s a small built in 300 note capacity sequencer and a X/Y-joystick for controlling mod- and pitch-effects.
The Pentaphonic Clear came with a transparent Plexiglas casing and transparent spherical Knobs.