scorditura (or "string-specific transposition")

[Graham Percival]

I know how to display the new tuning for a stringed instrument.  Can 
Lilypond (almost certainly via scheme) print the noteheads correctly?  
I mean, can the lilypond input file be written in C, and have 
Lilypond/scheme transpose only the appropriate notes?

In my example, the viola C string is tuned down to a B.  I have my 
input file written at pitch.  Can I tell Lilypond to transpose all 
notes on the lowest line of the alto clef (and lower) up a semitone?


Cheers,
- Graham