Gotta say, couldn't tell if the drums were fading in and out as a dynamic layer, or as part of the track. The ambiguity was kind of cool regarding that, honestly.
Ahhhh. That explains a lot. No wonder I couldn't tell--I was thinking there were only two layers! Those extra layers really do add a lot to the experience.
Holy cow, it's all so simple...and so very effective during gameplay! I literally had no idea that the loop was only around 8 bars. I'm impressed all over again ;)