I presume that's the default. If you don't have a pedal set up for volume then it won't matter anyway.
If you choose Input and turn from -5 to +5 the gain (or volume) definitely increases. I dont know if its a good thing? I'm in my small apartment, cant test at gig volume. But I imagine a higher setting can make it easier to get desirable feedback ? Have you tried to do as suggest, what is you opinion?