Quote:
Originally Posted by tINY 
How much does good air to fill the control room with cost?
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This is actually quite a sensible question, though no doubt offered ironically.
Quite apart from the air quality issues (as per the BlueSprocket response) and all that unpacks from that, there are also serious questions about the way sound waves travel in differently composed (heavier, lighter etc) gasses and in higher- or lower-pressure gaseous mediums. There's actually quite a body of (seemingly credible) research into it. thumbsup