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Solved!
after mesaure R1 and R2 ( they are ok) y saw a little drop of solder between 2 legs of the drive pot
now it has a great gain
thanks anyway!!

i just finished my second serendipity pedal and like the first, it dind sound like a zendrive
it have low gain
ive checked the pcb too much times and all is correct
ive used 4558 ic
if i take off the ic the effect dont sound (obviously) but if a take off both transistors the effect still sound !!!
i suppose that the problem of the gain are related to the transistors issues so i hope anyone can help me
i dont want to re build the effect for  3rd time
thanks!