Thank you Graham.
It works perfectly! I understand that I need to rename ALL pitches, otherwise 
the building fails.The only problem now is that I have lost the default 
microtonal symbols.
So for example, how do I re-write the default symbol ceh (to have the symbol 
"d")?
In your example it is: (ceh . ,(ly:make-pitch -1 0 (/ FLAT 2))), but this 
doesn't show any accidental.
(I can't find information on internet)
Kind regards,Luca 

> Subject: RE: Microtonal notation - arrows up and down
> To: [email protected]
> From: [email protected]
> Date: Sat, 9 Jan 2016 22:45:03 +0000
> 
> > Date: Sat, 9 Jan 2016 20:39:15 +0100
> > From: Luca Danieli<[email protected]>
> 
> > Yes, it works perfectly.
> > But I am only able to replace for example the standard symbol for fih 
> > (quarter-tone) with an arrow-up symbol.
> > I was wondering if it was possible to use both symbols instead of replacing 
> > one type with the other.
> > I would like to use arrows to indicate tone-colour and standard notation to 
> > indicate quarter-tones.
> 
> You choose some new names for the arrowed pitches, and add them to the 
> list, along with the original quartertones.  Something like
> 
> 
> 
> arrowedPitchNames = #`(
>         (ceses . ,(ly:make-pitch -1 0 DOUBLE-FLAT))
>         (ceseh . ,(ly:make-pitch -1 0 (* FLAT 3/2)))
>         (cesel . ,(ly:make-pitch -1 0 FLAT-LOWER))
>         (ces   . ,(ly:make-pitch -1 0 FLAT))
>         (cesir . ,(ly:make-pitch -1 0 FLAT-RAISE))
>         (cesih . ,(ly:make-pitch -1 0 (/ FLAT 2)))
>         (ceh . ,(ly:make-pitch -1 0 (/ FLAT 2)))
>         (cel   . ,(ly:make-pitch -1 0 NATURAL-LOWER))
>         (c     . ,(ly:make-pitch -1 0 NATURAL))
>         (cir   . ,(ly:make-pitch -1 0 NATURAL-RAISE))
>         (cih . ,(ly:make-pitch -1 0 (/ SHARP 2)))
>         (ciseh . ,(ly:make-pitch -1 0 (/ SHARP 2)))
>         (cisel . ,(ly:make-pitch -1 0 SHARP-LOWER))
>         (cis   . ,(ly:make-pitch -1 0 SHARP))
>         (cisir . ,(ly:make-pitch -1 0 SHARP-RAISE))
>         (cisih . ,(ly:make-pitch -1 0 (* SHARP 3/2)))
>         (cisis . ,(ly:make-pitch -1 0 DOUBLE-SHARP))
> ...
> 
> 
>                       Graham
> 
> 
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