Use Sibelius 6 Sib. files to make audio where choir sings words.

I'm looking for someone who can take Sib. files for some compositions written using Sibelius 6 music software and take the requisite steps to create audio files (e.g. mp3, aiff) where the choir in the score actually sings the words rather than just going "Ah"! I've read that music software is now able to do a decent job of singing lyrics, as well as playing the rest of the score using sampled instruments, but I lack the software and technical expertise to make the necessary files - online sources mention MusicXML files - out of my Sib. files, etc. I have ten pieces of music I'd like to have re-rendered with the lyrics sung (and otherwise sounding as good as the contemporary technology will permit!), ranging from c. 3 minutes to c. 12 and a half minutes long (there's also one piece that's just solo piano, but I'm open to being convinced this can be made to sound better too!). See: www.peterswilliams.com/composing/ to have a listen to the Sibelius 6 renderings & see the scores (for the lyrics!) of: a) the suite 'From glory to glory' and b) the piece titled 'Weeping turns to joy'. I guess producing the best sung sound from the existing scores may require making some level adjustments between the choir voices and instrument lines. With thanks.