[Modulation matrix]Velocity to filter envelope depth?

I want to modulate the filter envelope depth with the velocity :

>> the harder you play, the more the filter is modulated by its envelope

(N.B. this is not the same as velocity to cutoff).

Is this possible with the mod matrix ? Maybe with an ‘operator’ ?

Yes…

Create an operator that multiplies an envelope by velocity; and route this operator to filter cutoff.