I have GPO Sibelius upgrade and it works great. I have recently purchased JABB and installed it in order to use it as well with Sibelius, so I downloaded the updated Garritan Studio v.2 (GarritanStudio0004.zip). I can use JABB with no problem as a RTAS plugin in Protools Le, but whenever I try to use with Sibelius (previuosly launching Garritan Studio) the following things happen: First on Garritan Studio, if I click on any of the eight players it shows in Bold face the word "PERSONAL ORCHESTRA" but the words "Jazz Big Band" appear barely shaded and can not be selected. Second, when I launch Sibelius JABB does'nt appear on the "Playback Devices" box so I can't make it work. Nevertheless GPO Studio (1-8) instances do appear in this box. I would appreciate any help you guys can give me. Thanks in advance. Greetings from Venezuela.