[NickZ]

have you run the engine to high revs yet, enabling a filter on a square wave doesn't sound good.

[romP44]

Trigger filter - A time based software filter that will ignore crank/cam inputs if they arrive sooner than expected based on the current RPM. The more aggressive the filter, the closer to the expected time the filter will operate. Higher levels of filtering may cause true pulses to be filtered out however, so it is recommended to use the lowest setting possible

It is a software filter, not really a frequency filter.