Method
The most common and effective method of woodwind growling is to hum, sing, or even scream into the mouthpiece of the instrument. This method introduces interference within the instrument itself, breaking up the normal quality of sound waves produced. Furthermore, the vibration of the vocal note in the mouth and lips creates rustle noise in the instrument.
The vocally produced note can be the same note (though this is believed to be less effective), a natural third or perfect fifth, or any random note, usually from a different octave than the note the instrument is producing. The latter choice is believed to cause the most interference and yield the darkest, grittiest timbre.
Read more about this topic: Growling (wind Instruments)
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