h a l f b a k e r y
Recalculations place it at 0.4999.
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The "atmosphere" preset in a keyboard will really mean that.
For a given geographic location, get the readings of barometric pressure for a whole year, remove DC component, normalize data to [-1,1] and save it as a wav file.
Play it looping thru a sample player.
Combining sounds from different latitudes, i.e. sahara, antarctica, australia, etc, we can get an
authentic sound from the earth.
||Humidity readings as a counterpoint.
||As a perk we could play it backwards.