Hi,
Well, in the real world back when I was young and the Space Echo first arrived in the mid 1970s, it did seem to have been created by some form of alien intelligence, and it was a real beast of a thing to try to control. Very unpredictable, and prone to drift off on it’s own accord whenever it felt like it. It made life interesting.
Regarding the tape heads and note division, you have to remember the delay time you set is actually tied to head 3, with heads 1 & 2 working as subdivisions, ie thirds of to main time. For example if you set a max delay of 900ms, that is what happens on head 3 and subsequently the time of head 2 is going to be 600ms, along with head 1 at 300ms. The same thing applies when using note divisions. Also, the various combination of playback heads tend to create different patterns. Ultimately, it’s all mathematics.
Before buying my first rack mounted DDL in the early 80s (Ibanez DM1000 still in my rack), I used my old Simms - Watts Echo Dek, (Google it) - 3 tape heads with a seemingly endless spool of tape in a circular cassette from Sony. Oh, what fun and games with that thing, many happy hours of cleaning and de-magnetising tape heads. It’s a lot easier now.
Hope this helps/makes sense.