The Beast

1969 Emmons Single-12
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The Beast is a 1969 Emmons Single-12 on a D-12 frame.  I've owned it since December, 1998 and have done most of the work on it myself.  When it came to live with me, it had 3 pedals and 5 knee levers and an extended E9 tuning.

The table below shows the copedent (ChOrd/PEDal arrangemENT -- thanks to Tom Bradshaw for something to call it) for the Beast.  It has 6 pedals, 6 knee levers, and a relatively standard E9/B6 universal setup that I've been using for about 25 years.

It is noteworthy that this tuning is what I consider the minimum setup to be able to duplicate the pedal functions of a stock D-10.  
1,2, and 3 are the A,B,C pedals.  
The P4 C6 changes (A to B on C6 / G# to A# on B6) are not included.  
Pedal 6 is on LKR -- release RKL when engaging LKR to raise the 4th to E and lower the 8th to D.  
C6 pedals 5,7, and 8 are P4,5,6 on the Beast.  

Knee levers are all there
E's to F's ;  E's to Eb's ;  2nd string C#/D/D# ;  B to Bb (same function as C to B lever on C6) ; there's even 6th string G# to F# and 1st string F# to G#.  

No Franklin pedal.  No 2nd string raise to E.  (These may be possible on the push-pull mechanism, but I prefer not to push my luck)

You have the exact C6 tuning 1/2 step lower, with the equivalent of G or D on top (F#=1st string; C#=2nd string w/RKL engaged).  There's also a high 6th (3rd string) -- like having a high A on C6.  It's no big deal, but it's there and is useful -- you may also raise it with P2 to go from the 6th to the b7 (e.g., B6 to B7 open).

There's a lot of stuff there, friends and neighbors.  And it's all available together.  C6 positions become E9 positions and vice versa.

This tuning is the starting point for any other 12-string I purchase or set up for myself.  For example, The Fessy has 2 more pedals and 2 more levers and doesn't have a whole lot more to offer above this simple setup.