The first 35 seconds will give you an idea here
I've noticed that there seem to be some notes below my low B on this song. I have a 35" bass and some heavy-gauge strings, so I would have no problem tuning down...what is common for gospel bass? Tune only the lowest string a whole step down to A? Tune all five strings down a half step to flat tuning?
Especially that low note at 30 seconds or so...I am not home now so I can't try it out, and I can't tell if it's an A or a Bb