How can key"id PRT SC" be activated?

So I used to work for time warner cable and have a bunch of splitters lying around. I have 2 ways, 3 ways, 4 ways and even 5 ways. This was back in 2013. I was just cleaning and ca...

Is there a technique to know how you sound to others. Without recording. If recording is an option how far away should I be from the recorder...