I recently purchased a used DTX-MULTI12 and some of the original sounds are corrupt or missing. When I scroll to some of them, they appear as installed, but no sound comes out. I would say 15% of the original sounds are missing. I've troubleshot the pads themselves, and they are all working. I've also tried to reset to factory setting, and updated the firmware to 1.10. Any ideas? Is there a place I can download the original WAV files and patterns?