I’m looking at the Main Mixer window and all output channels are set to the Main Stereo Out buss. This is indicated at the top of each strip with the words ‘Stereo Out’ in white on a black background. All these channels are audible, except for one channel which at the top has the words ‘Stereo Out’ in white on a GREY background.The meter shows there is audio there but nothing is reaching the Stereo Out buss.
As far as I can see all channels are set up the same way.
What am I missing? - it must be something really stupid!