how do I edit the right channel of an audio file? It's greyed out. never seen this before

[Alastair L]

[Alastair L]

ah it was the channel mute on the right, funny place to put a channel control.

OFF


ON 

[SteveG_AudioMasters_]

So where would you have put it? Bear in mind that it's also available as a menu option and some keystroke shorcuts...