Great!
Now I've played with it for a while and got the chance to compare it to sound samples at http://www.hollis.co.uk/john/circuits.html there's a lot of difference in the sound.
The flanger-like sound isn't there in my build.
Could it be the kind of IC chips?
I did a layout for Madbean's version of this circuit (Crash Sync+LFO) but I've completely forgotten about it.
I've uploaded it in Contributions if anyone is interested.