how do I change which notes are triggered from my midi in piano roll

when I strike the lowest note on my external midi device, it triggers a drum sound halfway up the available sounds in the drum 'kit' on the piano roll - I would like my external midi to trigger a sound which is 'lower' on the internal sound piano roll so the upper half of my midi isn't rendered useless - I would like to do this without changing the positions of the internal sounds which are assigned to specific notes, because I switch external midi keyboards which range in size, so I would rather have logic be able to move where the external trigger is placing its request of a sound in the piano roll..... I hope that made sense!! Don't have much terminology knowledge