PSR SX 900 strange extra noise when I play the ConcertGuitar SOLVED

[Jeepee]

Hello,

I'd like to ask about something strange in my PSR SX 900. When I play the ConcertGuitar or other acoustic guitars, there is a soft humming noise in the background. It is not audible in electric guitars or voices from other categories like piano etc. It is with and without headphones, and with or without effects. Installing the latest firmware made no difference. I also did a factory reset. Did someone else experience this? Any ideas for a solution are welcome.

Bye, Jaap.

[Jeepee]

I found out with some help that this strange sound is ok, it is the sound of the guitar-body that was recorded in the guitar sample... I didn't notice this before in previous models.