how to use dhd acapella choice?
['Assure proper setting of the dial on the end of the Acapella. ... ', 'Sit up with good posture to use the Acapella. ... ', 'Take in a fairly deep breath and hold it for about 3 seconds.', 'Place the Acapella mouthpiece in your mouth. ... ', 'Exhale as much as possible (but not to forcefully) through the mouthpiece.']