I will check it. The first PSR-s900 had problems right out of the box. I noticed it when I was playing the keyboard in my office. My midi sustain unit is kept in the trunk of my car.

With the second keyboard, I noticed the problem one time, right out of the box, but then it went away, and everything seemed to work fine - until I got to my gig.

I will check to see if the unit is sending some unwanted code. Thanks for the suggestion.

Beakybird