Hi, probably I've got something wrong, but I've had my MZ-X500 for 1 day now and have updated it to v1.50. Since doing so it seems that I can't change tones after a while. Changing registrations changes the tone but I don't seem to be able to choose a tone from the tone bank. the ones I select change colour but no difference to the sound. Help me, Casio forum, you're my only hope!