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Audio channel format grayed out
Hi,
Using Premiere Pro CC 2014
I have a L&R stereo audio track which I’d like to convert to mono. When I right click on it and select “Audio Channels”, I get the “Modify Clip” dialogue box. But most of the options are grayed out including “Channel Format” which I’d like to change to “Mono”.
Any idea what I’m doing wrong?
Robert