I recently purchased this pedal used and have noticed an issue that I am concerned about. With the drive and distortion level maxed I get a “squeal” from the pedal. The frequency of the squeal will change when sweeping the tone knob from low to high. The squeal will also occur when the distortion and drive level are set lower (3 o’clock) but the boost is engaged. I realize I will probably never use the pedal with such high settings but it bothers me that this is happening and I’m wondering if the pedal is just too “hot” or if mine is defective. Any input is greatly appreciated.