The Audible Life Stream is that which carries us to the Supreme Creator, according to Julian Johnson in "The Path of the Masters".
"The Audible Life Stream is the supreme Creator himself vibrating through space. It is the wave of spiritual life going forth from the Creator to every living thing in the universe.
"The higher we go the more enchanting the music. In those higher worlds the music is less mixed with matter, and so is not dulled."
Johnson uses sound to guide him to the upper realms. He quotes from the Bible, "In the beginning is the Word", it is what drives Creation.
I must confess that I have not experienced the Audible Life Stream. I will journey on it and ask my guides what it is and, maybe, experience it myself.