I need to do the above in order to burn a CD for A2 Composition to send to the exam board. When I try to export audio the message says: "Some of the devices in the current playback configurations are not virtual instruments." How can I make all the instruments virtual? When I click 'ok', some instruments are missing when I listen to the audio. I've looked in the Sibelius 5 help guide, but the section on audio is bewildering (for me)!