I bought a Yamaha BB405 and have no idea what brand Yamaha puts on the bass from the factory. I think rotowounds. I also read somewhere about putting butter on them etc to get rid of the metalic sound. Any ideas? I like the feel of the set on the bass and dont feel i need to change them. I have been playing on them for 2 weeks daily and the ting sound is still there.Wouldnt butter being an animal product get gross?