I have a director that says that all the time she has no clue how to do lighting. If you bright the light down she will complain that you can see the person on stage. It goes back and forth untill we are on to the next seen.
Just like with lighting you can take any plug and route it to any channel on the board.
For instance, Plug a microphone in the floor into channel 1 located stage right, that plug is hard wired into the patch-bay. Hopefully, it is labeled. You take the patch cable and plug it into the...
I use a Lemaitre LSG Unit that uses a Liquid CO2 "Dewar" Tank. It Works Awesome, You still have to know what you are doing. Liquid CO2 IS Cold, but all in all your pretty safe with this unit. don't mess with LN2, too Dangerous. It is not worth the hassle.
Our theater does 3 productions each year. one musical a one act and a normal play. We put a lot of time and money into sets, effects, lighting and sound. I think it is more like a brodway, but it is high school.