Korg Poly800/EX800 Users

The CV input would be extreamly simple to do. The actual delay is controlled
by a sine wave generator making a CV for the voltage-controlled pulse 
generator... this is fed into a clock chip to drive the delay line.

At least, this is what I think, judging from the schematics. I'm not exactly
an electronics expert. Though the mod I completed changed the rate of the
sine generator by varing a resistor (and changed a capacitor) tends to say
I'm correct.

If this is right, CV inputs could be added to the sine generator to VC it's 
rate. You could also drop one at the output of the sine and have a delay
control... or pipe in some waveform and skip the sine generator. Or just
mount in a knob and there you have a delay control.... I think I'll try that
in a day or two.