http://www.elderly.com/accessories/items/TU2.htm This tuning pedal is my favorite. My problem is that the input jack causes loud buzzing and crackling if the input cord is bumped, touched or jiggled. Once I open it up, what can I do to remedy this? (The screw on the jack is not loose, and there is no soldering issue that I can see.) Is there something grounding out inside the jack? Hoping someone else has had a similar problem and can help me out. Big show Friday night, and I would like to use this pedal, for tuning and as a "mute" switch.