Sentence:  The most popular event is Joel's computer-based biofeedback game. ... The goal is to move the balloons skyward while avoiding the rockets that the computer shoots toward the balloons. You dodge the rockets by consciously adjusting your muscle tone between relaxation and tension. ... The little "<WSD>blip</WSD>" sound that happens when a balloon is shot down becomes a duet with the player. "<WSD>Blip</WSD>" "Damn!" "<WSD>Blip</WSD>" "Damn!" "<WSD>Blip</WSD>" "Damn!" 
Meaning of the word marked with <WSD> tags:  A short sound of a single pitch, usually electronically generated.