Just got and installed the BQC system into my NS-2 (EMG P/J Set), and I have a little issue. The midrange frequency knob creates a feedback when rolled nearly all the way down. It's like mic feedback, and it's kind of upsetting, but I don't know if I have a defective set, or if it's maybe just an amp setting. Has anyone ever had this problem before? The rest of the controls work just fine, and when the mid-freq is out of that small range, it works perfect.