AVMutableCompositionTrack - insertTimeRange - insertEmptyTimeRange issue

Question

I have a strange problem: I want to generate a new sound file out of two soundfiles and silence.

sound1: 2 seconds long + silence: 2 seconds silence + sound2: 2 seco

Answer 1

Still don't know what this "insertEmptyTimeRange" means. I made a work around with a "silence"-audio file which has nothing in it. I put this empty audio file between the two sound files and this does it for me. Question closed ;) (But if someone could explain this "insertEmptyTimeRange" this would be still interesting...)