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:
A quick look and listen to the new Studio Electronics collab
Seamless audio and MIDI switchover between computers