Q. I keep on hearing about transcendental sound vibration. What actually vibrates?

A. Any sound that glorifies the name, form, pastimes and activities of God, the Supreme Personality of Godhead (Krishna or His various incarnations) is transcendental sound vibration. “Transcendental” means that which is not contaminated by the three modes of material nature. All other sounds that are not connected to Krishna in any way are considered material.

Anyone who glorifies Krishna is actually vibrating transcendental sound. And if this sound is recorded using any modern technology, then the device that plays this sound is also vibrating transcendental sound.