Yamaha SK-20 This great little keyboard not only has a really usuable Hammond sound with sliders for 8 drawbars, and a cheesy string ensemble tone, it includes a one oscillator polyphonic synth. It all goes through an ancient chorus unit. Great control for mixing and decay of all tones. I used this board so much, it finally blew up on me at a gig, spitting and sparking as it went.