Appion

The default values for low-pass filtering (which are cues to the user as to appropriate values) are positive numbers. But the log files consistently show "!!! WARNING: lowpass filter value greater than zero; will ignore" and this message goes away when I use negative integers for the filter.

Searching the source code a bit, I can't see why this input checking is done at all...I don't see how the algebraic sign of the low pass filter has a meaning in the first place.