At the moment, I'm only using the standard tuning for 5 string bass. I've been asked to play for a soulful contemporary church here in the south. I've visited this church several times. And already knew they were not pleased with the now bass player. My question is based on the fact that I've read a lot of reviews of how some guys tune in flats. And in my mind I'm trying to understand the difference. Their layout of musical taste is from Fred Hammond, to Donald Lawrence, Marvin Sapp, and so on. Can someone please break down this problem for me.