DANIELE
I love to make music but I also love to make music
Hi Daniele, I don't own this library yet so I'm not sure if this is the solution, but I think I remember in the manual there is a distinction between keyswitches which are fleeting (affecting only the next note) and those that "stick" (affecting all subsequent notes until you send another keyswitch). I think it might have been velocity that tells the instrument which one you want?
I hope this is the source of the issue for you, because if so you will be able to get it to behave how you expect very quickly & easily.
Thank you Sam for the help. I already knew about this, I tried both with high and low velocity with no result, I don't understand how this KS behaves. I noticed that by pressing on it the attack knob go all the way down to 13 to return at previous position once the KS is released.