Alternate Methods
A woodwind growl can also be produced by allowing air to escape from around the corners of the mouth, causing a vibration in the lips and mouthpiece. Although this method does not set up patterns of interference, it does produce the characteristic rustle noise of the growl.
Alternately, it is possible to use multiphonic fingering to create a growl-like effects. The performer selects a bizarre or unusual fingering that causes the instrument to attempt to sound on multiple notes. This creates interference, but no beating or rustle noise.
Other methods include constricting the airway to create a "rasp".
Read more about this topic: Growling (wind Instruments)
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