Un-checking the Include 2 bar lead-in should work but it's not so I reported it as a bug and ask for a drag button to export the BB Chord Output track midi and have it so it will include the lead-in bars if no bars are selected in the chord sheet or export the selected bars, so if all bars are selected it will export the whole song less the lead-in, or if just 4 bars then 4 bars only.