As I recall, Pedulla's version of the NTBT doesn't have a gain potentiometer, though the wires are there if you want to add one (as I have done, because I also installed a passive bypass switch).
Two pickup basses tend to cancel certain frequencies when both pickups are on. If you use both pickups on the Roscoe, perhaps that's coloring the midrange in a way that you like. Words can be so imprecise when trying to describe tone.....
BTW, I'm presently mixing an album for some friends... and trying to slot a really distorted bass into the mix (my Ric 4001 was used on some tracks). Want the tone to be fat, gnarly, and aggressive, yet controlled enough so that it doesn't sound obnoxious. Lots of little (and some big) EQ adjustments!
Two pickup basses tend to cancel certain frequencies when both pickups are on. If you use both pickups on the Roscoe, perhaps that's coloring the midrange in a way that you like. Words can be so imprecise when trying to describe tone.....

BTW, I'm presently mixing an album for some friends... and trying to slot a really distorted bass into the mix (my Ric 4001 was used on some tracks). Want the tone to be fat, gnarly, and aggressive, yet controlled enough so that it doesn't sound obnoxious. Lots of little (and some big) EQ adjustments!