The sound of two Eurocopter EC 155 B1 helicopters, flying by very close to each other, just a few hundred meters away, from where my recorder was placed. The Doppler effect is quite easy to hear in this recording. You can also hear the wind blowing in the trees.
Recorded with a TSM PR1 portable digital recorder, with external stereo microphones. Edited in Audacity 1.3.5-beta on ubuntu 8.04.2 linux.
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