Re: tranpose relative to the last pitch

[David Kastrup]

Tom van der Hoeven <address@hidden> writes:

>> David Kastrup schreef:
>>> David Kastrup <address@hidden> writes:
>>>
>>>> Tom van der Hoeven <address@hidden> writes:
>>>>
>>>>> Suppose I have
>>>>> music = \relative c'{c b a g     f e e f     g a b c}
>>>>> my instrument is limited so it cannot play the pitch f end below
>>>>> I have to raise  f e e f by a terts of an octave
>>>>> Is there a function shift or can it be made such that
>>>>>
>>>>> music = \relative c'{c b a g     \terts{f e e f}     g a b c}
>>>>>
>>>>> is equivalent to
>>>>>
>>>>> \relative c'{c b a g     a g g a     g a b c}
>>>>>
>>>>> if you use :
>>>>> terts =  #(define-music-function (parser location ploep) (ly:music?)
>>>>> #{ \transpose c e \relative c' $ploep #})
>>>>>
>>>>> the c' after \relative should actualy be the last-pitch (in the example g)
>>>>> Help will be appreciated
>>>> The current development version has a new definition of makerelative
>>>> allowing for
>>>>
>>>> terts =  #(define-music-function (parser location ploep) (ly:music?)
>>>>    (make-relative (ploep) ploep
>>>>      #{ \transpose c e $ploep #}))
>>> Actually, looking at the pitches you ask for, you'll rather need
>>> \modalTranspose here.

> Thank you David,
>
> I see you point. With \modalTranspose you can automatically change the
> notes that are within the range of the scale.

I don't see that we are talking about the same thing.  Your example was
supposed to transform f to a (a major third up) but e to g (a minor
third up).  It seems like you want to stay in your mode.  \transpose
does not do that.

> But I change the notes based on visual inspection. In fact I colour
> all notes f and lower in red, so that it catch the eye immediately.

I have no idea how that is supposed to be related to your original
request.

> If I change a few successive notes I rather place no extra octave
> changing marks on the first pitch. ( the first f after \terts{ )
> It is clear that the pitches after \terts{..} might need extra octave
> changing marks because they relate to the pith just before \terts{..}

Have you tried the code I proposed?  Inserting \terts { and then some }
afterwards will then not change the octave relations at all.

> So within \terts I want to know the absolute value of the g before
> \terts{...}

Again, I have no idea what you want to say here.

-- 
David Kastrup