behringer, poly d

Behringer Poly D Polyphonic Analog Synthesizer 37-key Analog 4-Voice Paraphonic Synthesizer with Full-size Keys, 4 VCOs, Classic Ladder Filter, LFO, BBD Stereo Chorus, Distortion, 32-step Sequencer, and Arpeggiator
  Behringer Poly D Polyphonic Analog Synthesizer (PolyD / Poly-D)

The first truly portable analog synthesizer was released in 1971.