So you want to play a looping sound when a key is pressed? If so, look at the following:
Code:
import viz
viz.go()
ball = viz.add('ball.wrl',pos = [0,2,8])
sound = ball.playsound('boing!.wav', viz.PAUSE)
#play and pause looping sound with keypresses
vizact.onkeydown('1',sound.play,viz.LOOP)
vizact.onkeydown('2',sound.pause)