Great, I have sent the right VPK file 
You will have to wait a bit for update but I can give you support on actual feature.
1) LPB, could you describe what is behind this word ? If you mean LPF, there is one which use ADSR in PBSynth, see point 2.
2) I will describe the filter :
Picosynth, Picodrum, OPL2 ( you can choose them on MAC menu ) use the standard filter :
- NOFL does nothing, it doesn't filter at all ;
- BIQUAD contain a BP, LP, HP filter, so three different filter ;
- AMST contain only a LP ( you can set other value it does nothing, only LP, I need to fix that )
This NOFL, BIQUAD, AMST can be tuned by a Cutoff and a Resonance in the FLTR menu.
THERE IS NO ADSR for this filter on picosynth, picodrum, opl2.
Only a amp ADSR for this 3 engine. So it is only static filtering.
There is a synthengine name PBSynth in MAC menu, which has 2xADSR, the first one is a amp ADSR. The second one is a filter ADSR. To trigger the two ADSR, you need to create long note, so you need, to use "AMP T/N" in ENV. To try it, just put a note in step 0, then increase T/N at 75%. The X value is "synth volume", the Y value it "hold time". You will begin to hear the sound is longer. Then move to VCO, there is a ENVDEPTH parameter there if you press triangle.
Change the ENVDEPTH to 25%. Then change the Cutoff Resonance. Then go back to ENV, then change the FLT A/R you will see you are able to change the attack release of the filter. But you need to modify the ENVDEPTH to see it.
Today on psvita, PBSynth is the only synth which has 2xADSR, and it has only one LPF filter, no bandpass or highpass filter.
Filtering use lots of cpu and ps vita is more powerfull than the psp, but ps vita is available for only one week, I have noy work a lot on it, so i have not found synthengine which can play well on this platform today. Maybe the "sid" engine will works smoothly, but I can not tell before I double check it...
No problem with your funny english
