The human brain interprets all the notes as a single sound, but they are all still being heard. This actually plays a large part in why each mouth "position" sounds different from the rest. it will be convincing enough to be heard as 2 different tones.Įach note you sing produces many overtones, the relative volume of each changes depending on several things, including the shape of your lips and mouth, position of your tongue, etc. Sounds difficult, but if you can whistle a tune, then you are already capable of shaping your mouth to resonate with a desired frequency.Īs a result, that overtone (which was already present in the original sound) will become stronger and more emphasised. Then make a relatively small "oh" opening with your lips and shape your mouth cavity to resonate with the frequency of one of those overtones (octave, octave+fifth, double-octave, double-octave+third, etc.). Tighten your throat and make it 'ugly' so that the sound has a lot of overtones to begin with. In practice, you take a deep breath and produce a low steady tone in your throat (just with your vocal tracts). If you can do that strong enough (and especially if you can emphasise different overtones in a sequence), then eventually humans will start hearing it as two notes.
The effect of overtone singing (or throat singing) is to emphasise one of those overtones.
However, humans will just think of it as one note, and interpret the overtones as "timbre". Any note that you sing consists of overtones.
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