Re: make-music function question

[Gilles THIBAULT]

> Please, help me with my own music function creation.
> How can I modify music object or create a new one with
> existing music data and add sustain event to it?
>
> If I understand correct, I must use make-music function and  then use
> (make-span-event 'SustainEvent START) call to generate sustain event .
>
> Can anybody make short example, what such procedure must contain?
> It is my furst music function and I have not any experience with it.
> --
Do you  know the \displayMusic function ? It is very useful, and i think it 
is the base to start.
\displayMusic {a1 \sustainOn a \sustainOff }for example, will give you 
scheme description
of music and allow you to understand how things work.

You see here that you have to add a
       (make-music 'SustainEvent  'span-direction -1)
to the 'elements property of an 'EventChord event.
So the next step is to learn how to add an element to a list, with scheme. 
You can go to the reference manual of GUILE.
   http://www.gnu.org/software/guile/manual/guile.html
All  about list is here :
   http://www.gnu.org/software/guile/manual/guile.html#Lists

At end, you can read LSR, there is a lot examples doing things very close 
that you want to do.
For example :
   http://lsr.dsi.unimi.it/LSR/Item?id=82

Good luck.

Gilles