video upload by Thrif-T
via this auction
"This comes with the original power supply which has been modified with its own off and off switch - not sure why as the switch on the keyboard works just fine.

The circuit board that the buttons in the "Track" section are connected is loose, just on the left hand side, so when you press the buttons, they sink down a bit. probably just needs a screw tightened inside on that section of circuit board. all the buttons function perfectly - see the video below which shows that issue."