Hi Arya,
This forum is not a Sibelius user forum, but for Notation Software products (produced by Notation Software Germany GmbH). Sibelius is a different product.
Our Notation Composer allows extremely fine control of the note performances, and has it's own internal sound engine. You may want to check it out at
www.notation.com/NotationComposer.php
ttfn,
Sherry