hello styd_one and thinks you for your note. In december 2006, I made a core with DIN without any problem. It was MIOS 1.9d, MIDIbox 64 application. I don't use it for 8 months ( i made my wood keyboard, like church organ) 2 days ago, i 'm trying to use it, and you know the problem i find. Last night, i reprogramming the application and now, it's right!! Can a PIC lost its program ? ( It's good to me to try to write and read in English. I don't speak english since 1987, the end of school. Excuse me for the mistakes, i'm learning)