Yeah, what Tale said. Personally, I have one instance (with a set of coeffs) for the gfx and one instance for the rest. A slider change flags both as being old and needing updating.
The audio one I update in @sample, the other one in @gfx.
One thing to also note is that if you wish to support sub-block accurate automation, you might want to have a look at slider_next_chg and such too (Not sure if you do already though).
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