Dave Smith Instruments SYNTHESIZERS

Hello,

I have been trying to set the modwheel to close the vca amount while
opening the filter.
in the MW slot i have MW -> + 99 -> VCF
in one of the 4 free modultiaon slots: MW -> -99 -> VCA
level = 0
vca = 99

but it does not seem to affect the vca.
on the other hand, if i set VCA to 0 and the modWheel modulation of
the VCA to +99, then the modWheel opens the vca.

i wonder if i should try to reinstall the operating system, of if i
could be doing something wrong ? Any ideas ?

thanks for reading

Mathieu