I am having this problem as well, it is more noticeable when bypassed however goes away when the depth knob is at zero. I am also having excessive noise and hiss when the quaverato is on. I love the sounds that I am getting from this unit but currently with these issues it is unusable. Would it be possible to send it back for you to take a look at? I have tried to locate any microphonic components, but have not had any luck…