sync media file to transport issue

[gentleclockdivider]

I'm having a bit of an issue here .
First , I assigned my roland integra to 16 midi channels , played from the pc keyboard , all good .
I press record and start playing from the second bar ., so the file should have 1 bar os silence at thebeginning .
Load the midi recording in a media player , set mediaplayer to sync trasport .
However , It's never in time , there should be a bar of silence at the beginnng since I started to play at bar 2 .
It seems that cantabile ads arandome length of silence at the beginning , never the actual 1 bar length .