meanwhile you might want listen to an overtone live-recording I did back in 2002, when I started overtonesinging.
just one voice, some echo and reverb. no pitch-shifting or postwork. all live ;-)
So make yourself comfortable, sip a glass of wine, lay down on the floor, love your loved one or whatever makes you feel good.
Just enjoy the next fourteen minutes of your life and relax.
If you want to digg deeper into overtone singing, take a look at the site of my teacher Wolgang Saus: oberton.org
You will find a lot of overtone singing information, concerts and courses given by Wolfgang!