Choose Meredith or the Tibetan Monk.
Hold your device horizontally and turn it slowly sidewards to the left and right to modulate the voices.
Turn it up vertically towards you for muting the voices.
This application uses a short extract of the song “Early Morning Melody” from Meredith Monk's “Book of the Days”.
The recording of Tibetan chant has been published by Falsalama on freesound.org.