When I try to load the Vita Rock Drums soft synth, I get an error message that the following file is not found. YT-MX SD 01 OH 01 XC#1 Y02. I hit ignore, and it keeps popping the same message with slightly different file names, for example Y01, Y01c, etc. After going through them or hitting Ignore All, the synth loads. I can click on the various drums and see the visual representation but no sound comes out. Help!