velocity mudulation

[mindscape]

hi,

i'd like to know how to modulate the filter cutoff or the volume by the velocity strike on the keyboard.

in fact i did it half the way ; in the mod matrix, well, i choose as a source the "vel on" and as a destination "cutoff" and then the amount but there's the problem ; when i go under 0, let's say -40, when i strike hard the key the cutoff is then closed in proportion and vice versa. but if i go up than 0 (say +50) then there's no effect at all...

have a clue about that??
what i'd like is when i strike hard the keys the cutoff is wide open and if i strike slowly the filter closes partially.

thanx