Well, it may just be the song itself beginning loudly, so it sounds like it cuts off when it loops. I don't know if there is a way to fade in better or not? I'm using gdevelop for my game engine.
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I just thought I'd let you know, the problem I was having with your tracks looping (making a cut off sound in between loops), wasn't your fault. It is a problem in GDevelop, the game engine I was using. I opened audacity and looped your tracks and they were as smooth as butter, no cut offs. I fixed the problem in GDevelop by choosing "play a sound on a channel" option, instead of "play a music file on a channel" and it loops beautifully. Just in case there are other GDevelop users, this may help. Thanks again!