Gap between tracks

[Imjinman]

I am unclear on "gapless". I have just downloaded Endless river from HDtracks and near the end of a track it will cut a note short, insert a gap, and then continue the note as it transitions into the next track. Is this what you mean by Gapless-- ie the need to remove this Gaps?

If so how does one do it? I am using Minimserver, BubbleUPnP and I have a Simaudio Moon 180 (from an earlier post this is gapless). How does 'it' know when to insert a genuine gap between separate rather than continuous tracks?

Many thanks- this is pretty irritating and occurs on a few downloaded albums.