I have a Yamaha bass (not fretless) and I wanted to know what kind of strings i should get that would give a good, thumpy, upright kind of tone. I was thinking about getting some flatwounds, but im not sure if they would be good for playing rock in my other bands.... i need help!! I can't decide!! too many choices!!! edit: oh, i forgot to ask... can you play slap bass with flatwounds?