My Yamaha p140 is out of tune!?!
I have a Yamaha p140, and several of the notes have gone out of tune! Aflat and e-flat are now out by nearly a quarter pitch. I didn't think this was possible.
We do have a child who like to push buttons on the keyboard; is it possible he managed to "de-tune" the intervals some how? Is it possible to re-set the tuning?