You are right when you write to say that everything about us, tables, chairs, bricks etc. is originally emanating from sound vibration. This is also admitted in the Christian Bible wherein it is said that God said, Let there be creation. So actually the transcendental sound is the cause of creation, but material sound is not transcendental sound. We have to receive transcendental sound through the transcendental channel, therefore, Vedas are called Sruti. That means transcendental sound can be received through the ear. And by hearing this transcendental sound through the ear our heart becomes spiritually purified, and we can realize at that stage the transcendental Name, transcendental Qualities, transcendental Form, transcendental Pastimes etc. That is the way of descending process.
Letter to Hamsaduta dasa, 23 January, 1970