Some I've figured out, but a few I'm not sure about.
Instant/Limited, Instant/Permanent Until Death are clear.
What is Instant/While Equipped? And Delayed/While Equipped? Equipped what?
Delay/Permanent I think I understand, but how is Permanent different from Instant, generally speaking? Also suppose I want to apply a series of effects one on top of the other, like Transparency, for a smooth disappearance. So I would make the creature 5% transparent with the first, then delay another with 7% and so on, accumulating. I don't want them to run out, but I want all of them removed at once later when I do away with the spell. So, for a succession of effects like that I should use Delay/Permanent, yes?
Limited After Duration I don't understand at all. There is only one field where I can enter duration, so if that field is used for the delay, where do I put the duration of the effect that will occur after? The same thing about the other two "after duration" types, only Equipped After Duration is even more mysterious.
Instant/Permanent had me confused at first, I didn't see the difference with the basic Instant/Limited, but it turned out to play the effect every round. I think that's what it does, at least - I had it used only once with Play Visual Effect, and it kept firing it round by round until the spell ran out. So permanence conveniently terminates itself here. If this really is how it works, it could be very useful. Have you used it? Can you confirm this?
Instant/Limited (ticks) - well, how big, I mean how long are those ticks?
Absolute Duration - this seems self-explanatory, I know it's in seconds. It works smoothly, so I suspect some kind of sinister surprise or downside. Right?