Hi Jim,
I haven't been using the low-cut. I like getting that big phat sound in the lower register that you can hear on that recording. Not everyone's preference, I'm sure, but I played too many years with basses that couldn't do that full low-end growl so now I'm unwilling to give it up.
I think I had compression (or auto record level) on one time and I felt the sound was a little 'squeezed', which shouldn't be a surprise since that is what compression does. This thing actually has 3 different compressors and 3 different limiters from which you can choose. I should probably figure out which one to use to avoid over-modulation which I have gotten when the mic gain was set a little too high. Like a lot of high-tec electronics you can sort of run this thing on manual mode, auto lever, or choose your compressor and/or limiter. Maybe I should consult someone with an engineering degree.
My preference has been to try and record as straight and unfiltered as possible.
Bottom line: this is a powerful little recorder that can produce some incredible recordings faithful to the original source.
I also have the Zoom Q8, which, despite its name, has four channels not 8 - and onboard X/Y and two XLR inputs. Same good sound plus video with and incredible 160 degree wide angle lens. You can put the camera about 4 feet from a duo and get the whole thing in the frame. Thats' nice because by keeping it relatively close like that you're getting better, cleaner sound for the audio portion.
Here's a little clip from the Q8: