I've just bought a Casio PX-750 and I've been fiddling with the settings. So far everything works following the user's guide, except Keyboard tuning and Temperament option. The operation type explanation is confusing. I hear the beep coming from the keys but nothing happens. Every other option works perfectly. Can someone please input me a direct key sequence on an example? (say i want to change the scale to Pythagorean, how do i do it? what do i press in which order?) Thanks to anyone helpful in advance.