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cd74hc4049 were bad, and now a cd4049ube is good. And there is another idea: yesterday i tested it with a 9 volt battery (and works fine), so it is possible that my boss adapter is not enough for this circuit. But IDK. :)

I switched out the j201s with several pairs, but the problem was still there. I went to another store and bought another (but different made) 4049 chip and it sounds perfect. I cannot belive that there can be that kinda difference between the same sort of chips.

I made mine last week. I have the same problems with the distortion. How did you fix that? I tried to replace the ic4 with another kind of opamps, but when i want to turn the level, the blend and the distortion pots to the max. at the same time its dying.