ComputerVoltageSources

I've interfaced my Kurzweil Expressionmate through my PSIM to provide 
a ribbon controller and later designed a module using an 
AtomPro24 as a dedicated Expressionmate ribbon module.

I just recently bought a Kurzweil PC-2 which is just the passive 
ribbon from Sweetwater for $50. It came today and I've written a small 
program on the PSIM to control it. The PSIM inputs are 100K to ground. 
I drive the ribbon 'potentiometers' from a CV output of 5.6 volts and 
put a diode drop to ground.  This floats the ribbon from 0.6 to 5.6 
volts. If I read <0.6 volts from a ribbon section then there is no 
contact. That way I can detect ribbon contact to generate a gate 
signal. Right now I am just piecing the three ribbon sections back 
together for a continuous output of 0 to +10 volts.

I'm using three inputs (to read the three ribbon sections) and three 
outputs (5.6 volts, gate out, and CV out).

I need to come up with a better wiring scheme than this mess of cables 
and then I'll wire it into a VCO to see how smooth it is. I haven't 
really calibrated the min and max voltages and the offsets for the 
three sections but I assume I can get it reasonably smooth.

With the larger number of outputs from the current design I could have 
1, 2, or 3 ribbons each with a gate and trigger output.

I put a schematic of the ribbon cable pin out on my site
http://modularsynthesis.com/modules/DJB-011/djb011.htm

Dave