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Is there a list of functions which can be used in the "Apply Image Filter" equations?

The online manual and video only show simple channel arithmetic.

In the Affinity Photo WorkBook - London Calling 2 -  (p234) - lerp(SA,Sb,0.2) is used for "linear interpretation ... mapping the b channel to a mix of a and b channels "
So I assume there would be other functions.

 

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