BTW, it's good to know what you're setting.
Mic Sensitivity controls the preamp connected to the mic jack (and doesn't affect Line In). Hi boosts the incoming signal more than Low.
DPC is digital pitch control. You don't want anything messing with the pitch when you are recording. Make sure it's off.
Auto will try to maintain a steady volume level. In music, this is no good. And even if recording something like an interview, the auto boosts the background noise when no one is talking. I guess it's good for something, but I don't know what. Manual, manual, manual. If you do accidentally switch to Auto, the level display will change to white on black--try it for a second and see--so you'll be aware it's happening if you look at the display.
The low cut filter cuts out bass frequencies before they are recorded. While overly bass-heavy concerts are the unfortunate norm nowadays, it's better to get an accurate recording and cut the bass on playback. So...off. If supermegatectonic bass is overloading your mics, LCF won't help--it kicks in after the distortion is already there.