After playing with for a while , it wont give you the same result as their ms 20 plugin which sounds glorious .
ON the effect plugin there is always a low frequency bump present ( clean and dirty filter mode )
The vst MS20 only has the low freq bump in the less cpu intensive mk 2 setting ( ota )
So, when using the vst plugin in mk1 setting ( K35 filter thus no bumb ) going into the filter effect , the bump is always there , regardless filter type.
So I assume that the filter effect is just the ota version (mk2) with some minor tweaking and doesn't have the K35 (mk1 ) setting ,which would explain the low cpu footprint on both filters compared to the vst .