Changing velocity curve for live input

Hey hey,
is there a way to change the velocity curve for live playing?

Say I have a track sound with input Keys and output Synth and I'd like to 
lower the velocity curve sensitivity drastically.

I tried a few things with tvcurve and fvcurve, but either got mismatched types 
in subtraction or errors. I could finally set a positive weight, but 
apparently no negative weight.

Best wishes,

Jeanette

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