The Pollard Syndrum is an electronic percussion instrument, used by Prince on the For You album.
They were the first commercially available electronic drum. A set of pads (up to four) triggered a sound module that used an analog synthesizer to generate a sound. The drums were used in the disco era.
Up to four voices
One VCO per voice - square, triangle, saw
Two noise settings per voice ("snare")
One LFO per voice - square, triangle, saw
1 x "Sweep" effect (pitch envelope)
1 x "Sustain" effect (noise)