Dave Smith Instruments Evolver Keyboard
"There have been requests for both a rack mount Evolver, and for a polyphonic Evolver, so a 4-voice Polyphonic Evolver in a 1U rack seemed a logical choice for my second product. The 4 voices are each a complete Evolver, which not only provides backwards compatability with a monophonic Evolver, but also allows a number of cool features to play with. The Poly Evolver is a four voice analog synthesizer in a 1U 19' rack. It is fully programmable from the front panel."