Empty sound files after using microphone component as a response

Hello everyone.

In my experiment, I need to use the microphone component as a response to record the spoken responses of the participants. The experiment runs smoothly, the sound files are stored in the data file of the experiment but when I play them there is no sound. In some sound files, however, I can hear the sound of air. It seems the mic recorded something but it was only the sound of air like some white noise. How do I solve that problem? Thank you very much.


Does anybody know the solution to this problem? Thanks.