Imagine you had a single page playing, and the page had half its tracks at 1/3 of the main clock speed. What happens to them after 16 steps of the main clock?
a) you can send them back to position one together with the normal speed tracks
b) you can let them continue from where they are so the structure can evolve further – to produce what I quicly called a continuum.
The current implementation favors b) very much, but I can see how both a) and b) are desirable, hence my proposed solution.
Hope I makes a bit more sense now 