Korg Mono/Poly

Hello everyone, I'm new here and just recently picked up a Mono/Poly. 
After having spent quite a bit of time going over the manual and 
testing out the various paramters of the synth, I'm trying to figure 
out if the VCF EG is working on my MonoPoly. I can't seem to get any 
kind of a filter contour using the VCF envelope. I've adjusted the VCF 
EG intensity knob, but that only adjusts the filter, rather than the 
EG contour intensity . The only Filter envelope response I've had is 
when I'm holding down a note and its sustaining, and then I adjust the 
sustain on the VCF EG. The filter then sweeps up and down as I adjust 
the sustain level up and down. I get no attack or decay response at 
any time though. Is this normal? Am i missing a setting? I can't see 
how the synth would have a Filter envelope and then not actually have 
control over it. I've been able to get filter control using the LFO, 
but not with the VCF EG at all. If anyone has any ideas/suggestions 
they would be greatly appreciated.

thanks

Craig