I tried one before but I had difficulties registering hissing sounds like the letter 'S', making the audio hard to understand. I understand this is part of how

I tried one before but I had difficulties registering hissing sounds like the letter 'S', making the audio hard to understand. I understand this is part of how a conduction microphone works, as these sounds are not generated in the throat but the mouth. I'm surprised not to read about this in the article. Perhaps I did it wrong or I had a really bad microphone.