Prevent user from selecting quiz answer

I'm using CP5 and my project is predominantly quiz questions.  Each question allows infinite attempts and uses advanced answer options to 'show' audio feedback for all answers submitted (wrong and correct).
Also, each quiz has an audio introduction.
When a user enters a quiz slide, the audio intro plays, but the user is able to submit an answer. If they do this, the audio feedback for the question plays at the same time as the introduction audio. Similarly, if the user submits a wrong answer, then quickly submits another answer, the 2 feedback audios play concurrently.
So, things are working as I expect them to, but it's not ideal and is a little sloppy if a user doesn't wait for audio to stop before doing their thing.
Is there a way to prevent users from submitting answers while either the intro to the slide is playing or while another answer feedback is playing?
I haven't been able to figure out how to do this with advanced actions.
I also considered putting invisible, dead buttons or captions over the answers that would block a user's click until the audio is done, but there's no way that I know to put anything in front of a quiz object.
Thanks in advance!

Hi Guido,
please state your specific question in the posting as well, as after quickly reading it I had to stop and read a second time to really get the meaning of it.
So you want to know how you can prevent change of selection in certain cases:
For simple validation a client-side javascript would be easy, this way you can even prevent the submit-event from being fired.
For more complex validation you need the server, right. But I would not use the iterator method for this.
The "best" place for input validation would be do_handle_data, which is executed before do_handle_event, where you can react on the incoming row-selection-event and the validation result.
Regards,
Max

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