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I'm thinking you might have better luck by creating Advanced Actions.
Here is the approach I'd take if it were my project. Insert standard Text Captions that will be used where you are now using Success captions. Assign the audio to the captions. Configure them as invisible. Then create an Advanced Action to hide the other caption (which will hopefully stop the audio) and reveal the desired caption (which would play the audio).
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So I am using success captions in exactly the way you described BUT hadn't used the advanced actions. I will try that. Thanks.