Hi all, I have a Rock Tek Son Of A Pitch 2 tuner that I've been using for years. I've only ever just used it for standard tuning up until now. There's a button on the face of the pedal that I assume let's you reset it so you can downtune. When I press it, the display counts from 0 thru 9, but it doesn't seem to do anything else. Does anyone happen to have an instruction manual that they can let me know how it works? I've searched online, with no results. Thanks.