I purchased the Casio Privia PX -120 used. Everything seems to function well on it, but the octave above middle C (and above) sounds very tinny and high. I tried holding the tone/setting key and hitting transpose, but it doesn't really seem to solve the issue (although the sound is different). Plus, I don't hear a beep when I make a tone/setting change, so I'm not always sure it takes--although many of the changes do affect the sound. If any one can help with changing this upper octave twang, I'd really appreciate it.
