I decided to have a look at Cubasis 4 today since it came with GPO. I loaded a mid file, loaded the correct instruments into GPO Studio and told Cubasis that the midi channels were to use the GPO instruments (1-16 in players 1 and 2 respectively). I pressed play and heard nothing! I know it is something I am unclear about, as I am new to midi sequencing. I could see the VUs moving in the Midi mixer but I could hear no music. I think it is something to do with using GPO as a VST plugin in Cubasis, but all this terminology is new and a little baffling to me at the moment. I have been through all the menus in Cubasis but cannot find a way to get it to work. If anyone could help, I would very grateful.