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Perhaps a better version would have independent sound tracks of each ambient noise, so that you could adjust each individual part.

Or, at least different "flavors". I'd like to try "Busy Airport Terminal" and "Mall Scene".

For working parents, maybe a recording of your kids playing/fighting in the background. :)

Busy Airports reminds me of Brian Eno's Music for Airports.

Brian Eno + "3d Rain" link above = Blade Runner. Now I want to nap.

Like http://www.ambient-mixer.com/ ? I've long used that website to give some atmosphere to my tabletop RPG sessions.