OSC is zero but there is sound

[MaF]

I posted this in the official forum already. I created a patch that still gives sound with OSC Vol = 0 when being triggered. I have no idea how that is possible and I can't find any parameter that solves the situation because I want the sound to fade out via automation.
I uploaded it to http://www.mediafire.com/?55m3g1yxr74ec7p
and sent it to Access support.
Do you guys n girls have any idea?
thanks

MaF