make-music function question

[Michael Pozhidaev]

Hello!

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.
-- 
Michael Pozhidaev. E-mail: address@hidden
Tomsk State University. http://www.csd.tsu.ru
ALT Linux Team. http://www.altlinux.ru