If I would do anything other than a four string, it would be a five. But besides being predominantly an upright bassist, I also have this amazing fender jazz that non 4-stringers keep asking if i would sell it to them. It's that good. Besides, I figure if Jaco and Vic only used four strings, why do I need any more?
However, I do really like the sound of a low D and Eb on the bass. Nice and rich.
Nick