Has anybody ever heard of such an intrument? I was considering de-fretting a 4 string J type bass from the 7th fret on to try to get the best of both worlds; you'd be able to play "straight" bass on the lower frets and play melodic singing lines up on the neck.( higher region ) Do you guys think it would work? Could anybody please comment on that? If you think it would work, where would you start de-fretting? I did seach this forum before posting to see if this had come up before but couldn't find anything on the matter.