After losing my old tuner sometime last year, I decided it was time to get another and decided to go for the Korg PitchBlack. Display is easy to read, love the true bypass, seems like a decent pedal. Anyway, something I've noticed with it is it doesn't seem to be entirely accurate how I have it set up.. I think this is due to the calibration settings? Is '0' the number it should be on for 440 tuning? I have nothing to compare it to here, and my ear isn't the best. Thanks!