I find (see screenshot) "play silence at startup for hardware synchronization", which I understand plays silence when the first track is played and then if the sample rate changes, and then "do not play silence (leading and trailing), which I leave unchecked, and then there is the gapped playback between tracks, but this does not seem to actively play silence but it appears just to wait before starting the next track. Where have I not looked?
"play silence at startup for hardware synchronization" should actually play silent audio at the start of playback.