I'm using GPO4 in Logic 8 (OX 10.6.3). I've created a 5 piece string ensemble. Each player is on a different midi channel. Every time I play the piece one or more of the instruments plays and sustains all notes creating a most unfortunate cocophany. It is exponentially worse when multiple parts pull this trick (usually two or three do). The only way to kill the noise is to reload the instrument in the Aria Player. If I solo a player, on the other hand, there is no problem. I could, then, solo each and bounce the instrument to an audio file, but I need to hear the whole thing in midi before committing to a bounce.