The Analog Synthesizer SX-150 Mark II for sale at Think Geek features ten controllable parameters, line in and out, and a four octave range. You use an electrode stylus to play tones, but a printable keyboard overlay is available to play exact notes.
Analog Synthesizer SX-150 Mark II features
Pricing and Availability:
Girts shows off some of the new Erica Synths range, including the Graphic VCO, Black DSP 2 and the Resonant Filter
This crazy oscillator now has even more features