Check4change sound notification not working?

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I installed the add on check4change for my klickbuck account since klickbuck ads appear randomly.. In the settings, I chose to play a soind notification if there's any ad on the site but it so happen it won't play any sound.. I just found out that there's an ad to it when I luckily open the updated site :( Can anybody help me with this? I can't hear the sound notification.. when there's an updated ad. . What will I do? =(