Back length tuning

[Ric Brekne]

Hi folks

I would really appreciate hearing a bit about varying methods of 
<<tuning>> the back scale of instruments.  Anyone with knowledge of 
Duplex Dans methods, other  approaches, basic tuning methods that 
perhaps address the back scale in anyway would be very nice to hear from.

My basic understanding at present leads me to believe that the front 
duplex can be tuned to the detriment or enhancement of both sustain and 
tonal qualities if tuned slightly out of tune with the speaking lengths 
and that this applies to a much lesser degree to backlengths.

 Any discussion, info, etc would be greatly appreciated.

Thanks
RicB