I recently purchased multipad files (.PAD extension) to be uploaded to Yamaha PSR-S650 keyboard. However, .PAD extension is not compatible with the keyboard. As per the PSR-S650 manual any one of these files are compatible: registration files (.usr), style files (.sty), song files (.mid), and MDB files (.MFD). How can I convert .PAD files to at least one if not all the compatible extensions mentioned above? Thanks for your help!