"Every human being who has found his individual ground-note has also found the ground-note and key to his life.
The miracle of the voice is that it bears witness not only of his character but also of his development.
The essence of his personality is expressed by his speaking voice."

(Hazrat Inayat Khan)

Here, you can find out everything about the "Nada-Brahma-System" by Vemu Mukunda.