i just wanted to add to this, to emphesize how important i feel this subject is.\
because the FX in tvpaint are destructive in nature (i.e you cannot dynamicly keep changeing them, once aplied they become pixels)
it is al the more important that you can easily redo an fx later.
especially in a large production like the one i am currrently in (aprox 20 tvpaint animators )
so an easy way to store multiple stacks within a project is all the more important.
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