Hi there! I just got the Model D yesterday and noticed that for Oscillator 3, I have to turn the pot up nearly a semitone in order to get it in tune with the A-440 test tone. I'm thinking a calibration may be in order. I made sure that I updated the firmware when I got the Model D, and noticed the availability of the calibration mode available inside the Synth Tool. Is there documentation available on how this is used?