Pluggo: Additive Heaven's ADSR Envelope doesnt work stable

Dear All,

I've been trying to play the Max for Live/Pluggo patch "Additive Heaven" with my computer keyboard but
the ADSR envelope and curve exponent doesnt respond to the long attack times that i set, at first
it works but then when played a second time after a short break it just generates the sounds as if the attack time
is set to min. It's just not stable. Just thinking if it doesnt work stable with the computer keyboard.
...what could be the problem?
Would appreciate your help, thx, cheers!