Don’t have the OAA so cannot provide direct comparisons, (Hopefully other owners on the site will be able to provide them) however here is a link to some styles (Some of which I believe are Yamaha) http://wersiworld.com/CMS/index.php?option=com_content&view=article&id=60&Itemid=61 (How the styles were recorded I have no information on, (Including Revision number) however additional sounds and drums were added in later revisions, as well as a reworking of some of the existing sounds) and if you do a search on the web you should find more.
Regards

Bill