LE 4. For .wav files export (to iTunes) Individual track faders are OK but main stereo out fader has stopped working. I’ve tried changing usb ports. Please advise where else to check as there’s no obvious remedy in the manuals. Many thanks.
Jerry: Are your “locators” set properly before export 
They must be Blue not Red
and set for the entire length of your song.
and IMO export it to your Desktop first before putting it into itunes 
Jack 
Hi Jack, Many thanks for your suggestions. The markers are OK (blue) and I’ve transferred OK regularly straight from project file to iTunes. But it seems if I don’t select an effect in the output channel it doesn’t appear on the workspace track list and its master volume control doesn’t work. Maybe I’ve not noticed, having always included an effect on previous songs. But it does seem odd. However, using ‘write-read’ is effective for volume on the output channel (adding to the track list), so thankfully I can get on with the project. I’m loath to re-install Cubase because of all the set-up parameters that have to be considered! Thanks again. Jerry J
Jerry: Checkout this Cubase Le4 video on exporting
And checkout other Youtube videos on CUBASE LE4
Jack