Pb with Cubase 7.5 and Audya style compiler

I use Cubase 7.5 to modify Ketron Audya styles. Actualy, I get for some of my midfiles I create the message “double note on” when I try to transform a .mid in a .pat using the Audya compiler. Is there anybody who has already got this kind of problem ? What is the solution to avoid those double notes. I’ve open my midi channels and I don’t see any double notes in my lists of events in Cubase. Thanks for your help… Fabrice