Good afternoon, I own a Yamaha digital piano (codino) CVP309, for a few months now I have been experiencing the following anomaly: immediately upon switching it on it does not sound, it is preset to Piano effect; from there, inserting the other tones from page 1 and page 3, it does not sound, while page 2 works. On String, only the 1st tone does not work and, on Perc. & Drum some do and others do not.
What could be the cause? Thank you!