Persephone Station

While it is normal, it really sounds alien-like, very unearthly.

When backwards, it sounds like a normal Number Station, strange.

In this message you can hear numbers like in Number Stations, if reversed.

Number Stations are shortwave radio stations of uncertain origin. They generally broadcast voices reading streams of numbers, words, letters (sometimes using a spelling alphabet), tunes or Morse code.

The message says: 101 118 105 100 101 110 116 32 97 103 101 110 100 97 (twice)

which translating from the ASCII table becomes: "evident agenda"

It is part of "The Lost Experience"