The Behringer Poly D is an expanded, 4-voice paraphonic adaptation of the classic Moog Minimoog Model D. While it copies the core analog ladder filter, oscillator design, and general layout of the legendary 1970s monophonic Minimoog, Behringer "hot-rodded" it with a built-in keyboard and extra modern features. If you're interested in mastering the art of substractive synthesis as practiced by masters such as Jan Hammer, Chick Corea, Rick Wakeman, Jean-Michel Jarre, Isao Tomita and Keith Emerson, this is a great place to start. Will consider trade for MIM Fender guitar.