I have the idea that is the notes which fall into the minus in the events list. Forgive me but I'm not very skilled. I still use an very old version of Cakewalk when I buy a midi file, to edit and customize the file by changing instruments, controls etc . When I load a midi file into this cakewalk all events start at measure 1. When I load the same midi into BIAB some events are -1 measure. I can't get me head around that. When I make an MP3 it seems that the MP3 notes which are in the minus (-1) measure are dropped and the audible notes start only from the notes from measure 1 and on from there. Not sure if its making sense. Thanks for the replies, much appreciated.