sustain stays on while in #64

I  have a problem with some hammond vst's..for example VB3 ..when i'm using the sustain(#64) as on /off for the rotary..when the fast is on(pedal pressed down),the sustain seems to be still working..because when i take my hands off the  keys it still keeps playing,while my foot is on the pedal.IT should stop playing when i take my hands off?? So when its at off ,no probs changing chords..but when i change to fast ,everytime i change a chord the first chord is still playing. PS/when i use the modulation instead#1..it works perfect. It's like the sustain is on all the time when its pressed down. Using sonar x3./Ray