In additive animations, what pose is the additive offset taken from?

Hmm, so is there a way to set a new ref pose for the character so that you can do additive animations off a more natural pose than the T pose? Or maybe even a way of extracting a set of animations from one animation when matched against a base (i.e. a subtraction that you can then record).

How would that effect blends? If they are all matched against T pose and I change the ref pose won’t that throw everything off?

As you say, animating against the T pose for something like this wouldn’t really work. Didn’t know about sync groups, thanks for that I’ll look into them.