200e

the triangle, sawtooth and square wave outputs all lie in the same 
voltage range (0 to 10 volts), so I'd imagine that if one shape would 
work for you, the others would, too. I tried it out and it worked fine 
for me.. but perhaps I misunderstand your object. 

yasi perera

> I see what you are suggesting with that approach.  That will work 
> just fine as long as the CV output of the 259e is triangle.  But, I 
> do not see the effect being possible using the saw wave without an 
> invertor.  I'll have to give that a whirl with the triangle.