This filter seems to work in a [weird] way. Use these settings:
Cutoff: 0%
Reso 0%
Env 0%
Offset 100%
Nothing should be filtered. Now start playing and try to close the LP12 filter slowly (using offset knob). The sound quickly becomes silence when offset isn't 100%.
When Cutoff is any non-zero value Offset seems to work as an LP12 filter as you usually would expect.
Again I'm not sure if this is a bug or a [weird] feature.