Can you explain me why original MidiStore.h from BeOS and MidiStore.h from OpenBeOS is not same=3F The class is diferrent or not=3F If it's different how can we be binary compatible with BeOS=3F If everything is OK in BMidiStore there is only 2 things to do : decode Track Format 2 and encode all format=3F About Jam, how build jam from the files : jam-2.4.zip Thanks for all A+ Jerome