This is a small fragment of a human whistling in a special way, with tongue touching the top front teeth (leaving opening for air to flow), producing a sound that resembles a panflute.
(simulated with wet bread. . . ) with small ( toilet ) ambiance and fan in background. (octava mk012 cardioid, sqn 4s, fostex fr2le 48khz 24 bit, mono).
This is the sound of an actor, alone on stage, exhaling at the end of her performance before taking the applause in a small, half-full theatre. The audio was then slowed down.
I'm a student studying sound and i and recording sounds this is one of the recordings. This sound was created with real dry bunny food shuffling around with in a small container.