Here's the tuning I'm currently using for classical and progressive
(non-blues) rock music.  It's a ten string tuning based on the
diatonic scale in the key of F.

   ___LKL__p1__p2_____p3__p4__LKR___RKL____RKR_
 F ___+F#______________________________________
 E __________________-Eb_______________________
 D _________________________________-Db________
 C ________________________________________+C#_
 Bb____________+B______________________________
 A ___________________________-Ab______________
 G ____________________________________________
 F ___+F#______________________________________
 D ________+E_______________________+Eb________
 C _____________________--Bb_______________-B__

 I continue to use the E9th for country, swing, blues and most rock
music.  For jazz the E9th is better for chords, but this F Diatonic
is really nice for soloing.  The F diatonic also works well for
horn section parts in R&B - written parts are easier to read and to 
easier to find than they are on E9th.

 Theory of Operation

 The table below shows how pedal and knee lever combinations
produce the key signatures of seven diatonic scales with the bar
positioned at the 7th fret (the "key of C" fret).  These scales
use strings 1 through 8 and have a 1 octave range.

        key
scale   signature   combination
C       ---         ---
G       1 sharp     Pedal 2
D       2 sharps    Pedal 2 + Left Knee Left
A       3 sharps    Pedal 2 + Left Knee Left + Right Knee Right
F       1 flat      Pedal 3
Bb      2 flats     Pedal 3 + Left Knee Right
Eb      3 flats     Pedal 3 + Left Knee Right + Right Knee Left

 Using this tuning, I'm never more than one fret away from
a full diatonic scale in any key signature at any fret.  Pedals 1 and
4 are used in conjunction with 2 and 3, respectively, to add to the
variety of foundation notes available from the low 2 strings.

 As for temperment, I am tuning the open strings "straight up" to A440
equal temperment.  I tune the changes for the flat keys about 5 cents
sharp and the changes for the sharp keys about 5 cents flat.  This
directly counteracts the cabinet drop effect.  The tuning tends to
sound a bit "sweeter" than equal temperment as you stack the changes
to get the more remote positions (i.e. 3 sharps or 3 flats).  

 -Bobby Lee     quasar@wco.com