I thought I'd demonstrate one example of how the proChannel EQ works differently than I expect.
The link below shows the following: I created an Albion String instrument and routed it to a channel strip called "Strings". I then routed the output from the "String" channel strip to "Master"
Screen shot 1 ("Strings") shows the spectrum in the proChannel with the EQ active, but not filtering.
Screen shot 2 ("Strings") shows the the proChannel EQ active with a HP filter active. I chose 150Hz, to cut some bottom off. You can see what is cut off by it being greyed out
Screen shot 3 shows the "Master" channelstrip ProChannel EQ active but not filtering. It (imo) should have match #2, but it includes the lowered frequencies supposedly removed by the HP filter in Step 2.
https://goo.gl/photos/gvnbEHc5z98f3jfr6I have a more difficult-to-reproduce example , where there is audible amplification in parts of the spectrum where there shouldn't be. This may still be "driver-error", but this is not the behavior I expect. This done by choosing a steep HP filter curve. There is then on occasion amplification right above where the cutoff is supposed to be. In the case above there is amplified sound in the 150-500 Hz range (a guess). This is not the case for all HP frequencies and does not occur all the time. To me it sounds as a high-order filter over-shoot for the HP filter, but it is not reflected in the spectrum before or after the HP filter.
Allan