The point is to get all the sounds that come between each normal fret. They actually aren't hard to play once you become a confident bass player. I personally really like them. You realize when your playing that you actually don't use the frets alot to find your fingering (hu...huhu fingering). It sounds really great when you slide like from an open E to where the 12th fret would be. I want one, but the only one I played and liked is a warwick which is $700 (but that's cheap for a warwick). I think it would sound good to have a fretless bass in some metal bands.

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