Hi antto thank you for your reply.
What I want to do is a module of the x0x vco cause I love the sound of it very much.
The problem is the square sound and the rare part 2SC1583.
As we know the square is not a exactly a square wave, I got a nice scheme of a wave shaper that can give me a square from the sawtooth.
So I wander if I can get a sawtooth without using the 2sc1583 and to able to control it as 1v/ocv.
Way back Guest helped me to make a scheme of the x0x vco with the desired symmetric square wave but with 2sc1583.
If you want I can upload it for you, it's pretty cool
I thought it will simple enough to do (I mean the sawtooth)