FWIW
I have attached a slightly simplified and better version of instrument_ranges.ly
regards
Peter Gentry
\version "2.19.15"
% -------------------------------------------------------------------------------------------------
% include function file instrument_ranges.ly
% usuage include --> \include "./ranges/instrument_ranges.ly"
% usuage call --> \naturalizeInstrumentRange "instrument" music
% this function will confine all pitches to the individual instruments range
% Note the ranges refer to music transposed for each instrument not the true pitches.
% use % for comment outside scheme function - use ; inside scheme functions
% -------------------------------------------------------------------------------------------------
#(define (naturalize-instrument-range p instrument )
(let ((o (ly:pitch-octave p))
(a (* 4 (ly:pitch-alteration p)))
;; alteration, a, in quarter tone steps, for historical reasons
(n (ly:pitch-notename p)))
(define op (+ (+ (+ (* 14 o) ) (* n 2) ) (/ a 2)))
(cond
;; clarinet range e to f' -1 2 0 to 1 3 0 (-10 to 34)
((equal? instrument "clarinet" )
(if (or ( > op 34) (< op -10) ) (begin (set! o (+ o 1))) ))
; bass clarinet range eb to f' -1 1 2 (-1 2 -2) to 1 3 0 (-11 to34)
((equal? instrument "bass clarinet eb" )
(if (or ( > op 34) (< op -11) ) (begin (set! o (+ o 1))) ))
; bass clarinet range c to f' -1 1 2 (-1 2 -2) to 1 3 0 (-11 to34)
((equal? instrument "bass clarinet c" )
(if (or ( > op 34) (< op -14) ) (begin (set! o (+ o 1))) ))
;; flute range c to f' 0 0 0 to 1 3 0 (0 to 34)
((equal? instrument "flute")
(if (or ( > op 34) (< op 0) ) (begin (set! o (+ o 1))) ))
;; alto range c to f' 1 0 0 to 1 3 0
((equal? instrument "alto")
(if (or ( > op 34) (< op 0) ) (begin (set! o (+ o 1))) ))
)
(ly:make-pitch o n (/ a 4))
))
% -------------------------------------------------------------------------------------------------
% a variable for the notehaed color on pitch change
% -------------------------------------------------------------------------------------------------
my-color = #(x11-color 'red)
% -------------------------------------------------------------------------------------------------
% this function rebuilds the music object optionally changing pitch and notehead color
% -------------------------------------------------------------------------------------------------
#(define (instrumentrange music instrument )
( ly:music? string? )
; extract the various portions of the music object
(let ((es (ly:music-property music 'elements))
(e (ly:music-property music 'element))
(p (ly:music-property music 'pitch)))
; rebuild any 'elements unchanged
(if (pair? es)
(ly:music-set-property! music 'elements
(map (lambda (x) (instrumentrange x instrument)) es)))
; rebuild any 'element unchanged
(if (ly:music? e) (ly:music-set-property! music 'element
(instrumentrange e instrument )))
;rebuild the pitch and if a changed pitch add the color tweak
(if (ly:pitch? p)
(let ((new-pitch (naturalize-instrument-range p instrument)))
(ly:music-set-property! music 'pitch new-pitch)
(if (and (not (equal? p new-pitch)) (color? my-color))
(ly:music-set-property! music 'tweaks
(acons
'color my-color
(ly:music-property music 'tweaks))))))
music))
% -------------------------------------------------------------------------------------------------
% the Lily file calling function \naturalizeInstrumentRange "clarinet" followed by sequential music
% -------------------------------------------------------------------------------------------------
naturalizeInstrumentRange =
#(define-music-function (parser location instrument m )
( string? ly:music? )
(instrumentrange m instrument ))
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