According to the Tantric concept, Sound is the first manifestation of the Lord Parama Shiva; in its primary stage it is a pschic wave. Its very existence entails the presence of spandan or movement (‘vibration’) without which there cannot be sound; spandan is the quality of Saguna brahman and the world is the thought-projection of Saguna Shiva.
Vedanta deals with Parama Brahman (‘the Ultimate Reality’) which is transcendent and devoid of names and forms. One has to become well established in Shabda Brahman before realizing Parama Brahman. Vedas are not the product of conventional language but the emanation of reality in form of Shabda (sound, word) which is the sole cause of creation and is eternal. Purva Mimamsa, an esoteric discipline, from the point of view of spiritual growth aims at attaining the heavenly happiness by realizing Shabda Brahman (cosmic sound) by conducting yajnas that help control the senses and the mind; when the mind and the senses are subdued the inner subtle sound is realized as Shabda Brahman.
The prana, body and mind along with the entire universe, are all expressions of Mantra chaitanya. At the ultimate level of Shabda Brahman words become wordless, forms become formless and all multiplicity unified in Consciousness residing in that transcendent glory extends beyond mind and speech.