At the hs I teach at we use a xiosynth for our electric bass during pep band.
My bass player claims that the xiosynth is randomly shifting down a step in the middle of songs. He claims that he's not touching anything but the keys.
In order to get it back to A=440 we need to switch it off and on several times. We're using the built in 112 sound for want of something better.
Do I have a user error, or something else?