Last Tuesday 21 December 2004 07:50, John Check was like:
Having frets that shift is an interesting engineering
problem.
One could have a hydraulic insert of some sort or possibly a servo
controlled wedge system incorporated in the fingerboard. Tricking out the
actual fret wire might get you enough tolerance not to have
visible/tactilely nasty seams Somebody somewhere had to have tried
conceptualizing it.
Yes, I came across a Viola da Gamba designed to play Persian scales. Moveable
gut frets. Possibly a little simpler than you had in mind.
cheers
tim hall
http://glastonburymusic.org.uk