Yeah, understand it.
I actually tried implementing it with faders.
Even created a side-macro, independent from Matrix, whose only purpose was to handle faders.
But got to the same issue with not being able to intervene during a fadeout executed with “During”.
Which made me abandon this idea.
Last resort would be to have a separate slot macro running in a loop and slowly approaching the targets set by a Matrix macro.
But for some reason I don’t trust the looped macros for performance reasons.