Shepard Tone-based soundtrack

I'll show how I've made a soundtrack (well... two soundtracks, actually) which is based on the Shepard's Tone principle. The Shepard's Tone is an interesting audio illusion on it's own, but it's even more interesting to cunstruct a small music piece based on it. I'll show and tell how I approached it.
The video for which the soundtrack is made: • Опасный эксперимент : ...