Have you ever seen the sound of your voice? capella melody trainer shows you the overtone structure of your note in real time while you’re singing!
With this technique you can train your voice – best is to do this with your singing coach. The more overtones you see, those around frequency 3.000 Hz in particular, the „better“ your note sounds.
And if you think you don’t need this, at least you have an interesting „toy“ for different experiments.