Somebody will have done this before i'm sure, but my google skills have failed me, i wanted the pinballx navigation sounds to come out of my rear speakers (front of cab) for 7.1 format so i've updated the existing rflipper, lflipper and select sounds in audacity for that. Maybe of use to others, all in attached zip file - drop them into you pinballx\media\navigation sounds folder (after making backups of course!).
Not sure how they'll work on multi audio device setups or in 5.1, they probably won't but i can't test that!
Edit - updated with better left right positioning across left <- > right speakers. Attachment updated.
navigation sounds.7z