Some of the worst soldering you'll ever see = Roland TR77 / Bentley Rhythm Ace

[Circuitbenders]

It doesn't really matter that much what the value of the resistor going to ground on the input is, although i'd go for the 100K on the diagram rather than the 100ohm you wrote there. Its path to ground makes sure that theres no output when there no input. It won't effect the other resistors.

I'm not sure what you mean about the low values. The output will be in proportion to the input all the way down to 0v in theory, if your kenton actually outputs 0v. In reality you'll probably find that the workable range of the korg is somewhere in between 0-12v, and you'll have to adjust the actual cutoff knob to give the best response for the input CV anyway.

The LM358 is a single supply op-amp, but it should run fine on the +15v rail. You don't need negative output voltages for this so theres no point in using a dual supply op-amp like a TL072 or similar.

I don't see any reason why what you've got in that diagram wouldn't work.

[selfpreservation]

cool ill get to work then chers Paul