Lagoon crickets is a real recording of cricket sounds at night in the Laguna de Chacahua, Oaxaca, Mexico, made by Felix Blume and shared under CC0. Its Freesound page describes some crickets singing, with the sound of the Pacific ocean in the background. The timer fades it out at the end, after fifteen minutes without Pro or at the length you choose with Pro.
Where is the Laguna de Chacahua?
In the Mexican state of Oaxaca. Felix Blume's description says "During the night in the Laguna of Chacahua." and greensound's entry names the place the Laguna de Chacahua, Oaxaca, Mexico. Freesound's own map pin reads "Villa de Tututepec de Melchor Ocampo, Oaxaca, Mexico." His description gives no coordinates, so none are shown here.
What else is in the recording besides crickets?
Its Freesound title is "Crickets during the night, close to the beach in Mexico." The description reads "Some crickets are singing, sound of the pacific ocean in background," and a line above it reads "Night in Chacahua, crickets and waves in background." So the source itself names waves and the Pacific ocean behind the crickets. We say no more than that, because the source says no more.
Why does it have no recording date?
The Freesound page shows August 10, 2019, which is the day the file was uploaded, not the day it was recorded. Felix Blume's description gives no recording date, so greensound's entry holds none, and neither this page nor the mixer's info panel shows one. We would rather leave the date out than guess it.
How was it recorded?
His description says "Recorded by a binaural of 2 Sanken Cos11D on an Olympus LS5," and that the original recording is a 96 kHz, 24-bit WAV. Freesound lists the file at 8 minutes 45 seconds. greensound's records note it as binaural, made for headphones.
Is it looped?
Yes. What plays is a loop of twenty to forty seconds cut from that original, with a 2-second equal-power crossfade baked into the seam so it can't click. The window is chosen to be steady: none of its quarter-seconds is more than 10 dB, about twice as loud, above the window's median. The loop is then turned up or down by one fixed amount to match the other sounds, and any rare loud peak is softened. greensound's owner listened to a preview of the loop and kept it.