Here, for any who may find it useful, is a booklet containing all the chants for the hour of Sext from the Little Office of the Blessed Virgin Mary:
http://liberreader.files.wordpress.com/2011/10/officium-parvum-beatae-mariae-virginis_-ad-sextam_-online-release-version.pdf

Below is a link to the post where I posted it on my blog; here you may find more details, as well as some quick practice mp3's I made as well:
http://liberreader.wordpress.com/2011/10/20/booklet-for-sext-from-the-little-office/

Enjoy!