specific technical info on the Rumi project:  
 
Trk 1) 12 string, tuning CGCGCEflat, mode Cnat. minor, intro with mallets, then to slide 
Trk 2) 6 string, tuning CGDAEG, mode C lydian, cyclic slide hammer-ons & pull-offs 
Trk 3) 22 string chaturangui, mode D lydian dominant, slant bar work 
Trk 4) Dobro, tuning GBDGBD, mode G lydian #2, combined slide and mallet 
Trk 5) 6 string, tuning DAEABC, fingerpicking with paper woven thru lower 
strings, juxtaposing simultaneous slide work on upper strings 
Trk 6) 12 string, tuning CGCGCE, mode C7, bluesy slide fingerpicking 
Trk 7) Dobro, tuning F#BC#F#BE, extended harmonics then to slide 
Trk 8) 22 string chaturangui, mode D7, raga like sitar-esque picking 
Trk 9) Dobro, tuning CBEflatGCD, palm harmonics and slide 
 
*the 22 string chaturangui was designed by debashish bhattacharya, it is commonly tuned to an open D or open D minor on the melody strings, with the 
sympathetic strings tuned to the mode of the 
composition.