Share 'Applying sounds in Sibelius?'

Hi all!   This is my first discussion here on the forum since I've only been a member for a couple of days, and hope you'll be able to help me with this!   I use Sibelius 5 when I arrange (which is what I chiefly do at the moment) and right now I'm arranging a few things for SATB a cappella. Sibelius sound presets are quite bad when it comes to performance, especially when it comes to the vocal s…