It didn't work when I used a bluetooth headset with built-in mic. After I added another mic, it was solved.

Hi there, I use EM version 7.0.23 in windows 10. When I'm using Microphone as the answer input, all questions are playing in silence. I can't hear the sound, so can't answer the questions. But it works fine at other answer inputs like piano or guitar or solfege. How can I solve it? Best Regards, Theo