You can tune fine tune your energy with sound in much the same way as you dial in a radio station until there is no static and you have a clear signal. Frequency is used to remove static and interference so that you energy is clean and clear. There are many sources and methods of utilizing sound for this purpose- Tibetan bowls, drumming, crystal bowls, rattles, tuning forks, gongs, toning and mantra are all fast and effective.