I just got my new Px-560M a couple of days ago. It came with firmware version 1.12. When I first turn it on, the LCD screen showed that the upper 1 tone was set to Grand Piano 1 (default). However, the sound was not that of a grand piano (you can hear it in the attached take00.wav file). The sound is the same on the speakers, over earphones, and even when recorded in a wav file and played on my PC.
I tried pressing the "Grand Piano" key, but nothing happened.
I then updated the firmware to 1.14 and performed a "factory reset", but the problem persisted.
Then, by chance, I entered the "mixer" section. The sound immediatly changed to the correct grand piano sound (hear to take01.wav).
If I turn off the piano and on again, the problem reappears, and goes away (for that session) by simply entering the "mixer" section of the menu, whithout changing any parameter, just by entering that section of the menu.
I don't understand what is happening, and it doesn't appear to be a normal behaviour. Any suggestions? Has this happened to anyone else?
TAKE00.WAV
TAKE01.WAV