Hello Joris - From personal experience it was **lowering my voice** and **making it louder** that helped me find fluency. My experience came from having access to qualified healthcare professionals and the advice really helped. Whispering might work for some people, as each case presents itself with a unique user experience and I can't speak for everyone, but my understanding is whispering would give you less control over the air as it passes through, thus less control of your fluency, not more. I don't think your app has a market with people who stutter, that is my feedback. I don't see any advantage to those who stutter and to me sounds like a bit of a cheap gimmick that's better placed as a kids toy maybe. Not helping those who stutter, it's not a fit at all, that's my honest feedback. Best of luck.