Yiḏaki transcribed yidaki in English, sometimes spelt yirdaki is one of the most commonly used names although, strictly speaking, it refers to a specific type of the instrument made and used by the peoples of north-east.
A slight crack or air leaks in any didgeridoo will significantly degrade the sound quality.
Recordings exist of modern didgeridoo players playing continuously for more than 40 minutes; on Didgeridoo Concerto 1994 plays for over 50 minutes continuously.
A small 2010 study noted improvements in the asthma management of Aboriginal teens when incorporating didgeridoo playing.
Place the end of a straw in the glass with water and blow the air through the straw and you will see the bubbles in the glass.
You may have to adjust the mouthpiece to suit your personal preference.