There's a strangely placed ground connector in the cabinet which, if not connected properly could lead to amplifier buzz. This ground point is supposed to be connected to one of the screws on the back of the computer. If it is disconnected in your machine then secure it under the screw on the top right hand corner of the back of the EZ2DJ PC. This should solve any buzzing issues
Many machines have had their pedals incorrectly removed which has caused physical damage to the wooden mount on the machine for the pedals as a result.To avoid this from happening and correctly remove the pedals, unscrew the metal panel on the front of the pedal (not the metal plate on the pedal itself but the L shaped piece of metal at the front). Lift it away and remove the 2 Phillips head screws behind the pane before disconnecting the pedal switch. You can now safely remove the pedal from the machine.