[sdiy] jörgen´s tri vco-hard sync

[cj3000]

Hello all,

its time for another question concerning jörgen´s tri vco.
this time i would like to know how i can modify the sync input, so that 
it works like a hard sync. at the moment the vco only syncs when it is 
in audio range and i need it also as lfo.
i have seen the schematic from the SAS vco which has a modified sync 
circuit, but it´s the old asm1 based vco. and because i think it works 
differently, i didn´t want to adapt it, before i ask people who know a 
lot more then me.

thanks it advance.

chriss