After a request in the forums, I took a stab @ generating control voltage for the ever-lovable Gakken SX-150 mini analog synth. This initial sketch will convert MIDI note values 47-84 into varying pitches w/ envelope triggers on the SX. Those interested can grab the code here -

http://narbotic.com/files/MidiVox_SX150-100428a.zip

Hardware Setup:

• Switch the MidiVox AUD/CV jumper over to CV side (connecting the center and inner-most pin)
  
• Connect the shield’s signal output (left or right channel from the onboard 1/8” output jack) to the metal contact on the SX-150 stylus.
  
• Also, make a connection between GND on the shield to any ground point on the SX-150 (the exposed metal barrels on either of the SX 1/8” jacks will work)

The notes played won’t be in tune (that’s a tall order for the lil’ SX), but I’ve found that using a keyboard to control the Gakken is a lot big improvement compared to the standard stylus/ribbon interface

Please drop a line in the forums if you have any problems with the above code or the MidiVox kit in general. I’ll be checking them on the regular!

C