put a volta line on a measure, and set the repeat list as 2, 3, 4, i.e. ignore first time.
It's a very important basic music implement. for example: the measure before this one is for the first round to play, and this one for the second round to play, if as it is now, it fails, because it gets played at the first round.
I thought it maybe due to loop initial setting in the code caused this. we need a programmer look at it.
GIT commit: 3c7a69d