Correct Audio Midi Settings?

I am using an external microphone (an ATR USB mic) to broadcast over Internet radio.  I am not sure all my settings are correct.  Here is the Audio Device window within Audio Midi:
What is M under channel?  Should the Thru box be checked on that line, and unchecked on the others?  What does Thru mean? 
Thanks.

klk145 wrote:
It does state in step 2:
"Connect your receiver
The audio connection must be a digital connection. In all cases that I know of, this means an optical cable from your mac to the receiver."
That is what led me to believe HDMI-only might not have been adequate.
He was basically trying to make it clear that a digital audio connection is necessary. He wrote the blog entry at a time when the only digital bitstream output from a mac was the optical connection.
Also, is all of this setup/installing Perian/messing with Terminal really necessary if I am NOT using Quicktime to play anything on the Mini? Or simply playing a real DVD?
I believe the DVD Player app uses the same parts of the operating system as quicktime. So, yes, it's still necessary.
Also make sure you go into the prefs for the DVD Player app and set the audio output to the digital output. Optionally, you can also disable the dynamic range compression in here (it's better to use the dynamic range controls in your receiver, if you do want DRC enabled).
Right now I am using Plex or VLC to play media files.
I don't know about Plex, but VLC does not rely on the quicktime infrastructure. However, you do have to go into the audio prefs of VLC and enable the SPDIF function.
What if I want to revert to default Terminal settings? How would I accomplish that?
The commands to disable are listed in the blog entry, immediately after the commands for enabling it.
Don't be afraid. There are no downsides that I'm aware of to doing the steps outlined on that page.

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