I did an orchestral piece some months ago in GPO using 16 instruments with no problems. I recently decided to revise it, but am finding now that when I play it back I am getting sounds that stay on and build up - the only way to stop it is to close the file. I have done no changes whatsoever to the file. I recall getting similar problems with midi files some years ago, but this is the first time I have got it with GPO. I use the bundled Cubasis VST 4. HAs anyone else encountered this problem - if so I would be grateful for any suggestions.