Sorry if this is a duplication--it didn't seem to go through at first.
Franz--
List memeber David van Ooijen has some very helpful information on
this topic.
http://www.davidvanooijen.nl/
Look under the rubric "writings" on the left side of the page. I think
there is an interactive spreadsheet to do the calculations at the LSA
website.
I personally use 1/6 comma meantone and love the sound. No, not all
keys will be equally in tune (or rather, out of tune), but commonly used
ones will be very good. In general, it seems that raising (toward the
bridge) the odd frets (d, f) and lowering the even ones (c, e) is a good way
to start experimenting. Check fretted notes aginst open strings.
As to your loose frets: if they aren't too terribly loose you might
try a little matchstick wedge under the fret--behind the neck at the bass
side, where your thumb won't bump it. Just as a temporary measure until you
get up the fortitude to tackle new frets.
Good luck, and have fun!
Regards,
Leonard Williams
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