WHAT IS THE SIGNIFICANCE OF NAD YOG SADHANA?INNER YOGA-58
The word nada is derived from the Sanskrit root nad, meaning 'to flow'. Hence the etymological meaning of nada should be a process or a flow of consciousness. Ordinarily the word nada means sound. There are four stages of manifestation of sound according to frequency and subtlety or grossness.
The four stages are:-
(i) Para, (ii) Pashyanti,
(iii) Madhyama (iv) Vaikhari.
These four stages of sound should be understood scientifically.
1-Para means 'transcendental, 'beyond' or 'the other side'. It is beyond the reach of the indriyas, or sense organs, and the mind and other means of cognition. Hence para nada is the transcendental sound. It is indicative of a truth that there is a sphere of super-consciousness where the sound is heard in different dimensions.
2-Students of classical music are aware of the fact that every note is made up of different numbers of vibrations per second. They vary in length, speed and pitch. In Indian music these vibrations are called andolana. In one second a sound may make many thousands of vibrations.
3-Above a certain level of high frequency, sound becomes inaudible and can only be perceived subjectively. The ears cannot receive such sounds that are vibrating at a very high rate. Therefore, we are not aware of all the sounds that are present in the cosmos.
4-Sounds having a very high frequency are transformed into silence. Beyond a certain limit, the ears do not have the capacity. No one can hear or understand a sound like that even if it is present.
5-Para or transcendental sound has the highest vibration frequency. This intense vibration faculty makes para inaudible. Various texts mention that para sound has no vibration. It is a sound that has no movement and therefore no frequency. It is a still sound, but we cannot conceive of a sound that has no vibration, no movements, no motion. When a sound goes to its maximum pitch, it attains a sudden stillness, and that is para nada.
6-In the Upanishads, the sound of Om is said to be the manifestation of para. The audible chant of Om which we produce is not para because it is physical, subject to our hearing, understanding and logic. Therefore, the audible Om cannot be called the transcendental Om.
7-Para is a cosmic and transcendental sound devoid of all movement. It is both still and infinite. It has shape and light too. Its nature is jyoti (light). It is different from all sounds usually heard or conceived. The Upanishads clearly state, "That is Om, that sound is Om."
1-The second stage of sound, which has less frequency and is more gross than para, is pashyanti. It is a sound which cannot be heard, but it can be seen. Pashyanti in Sanskrit means 'that which can be seen or visualized'.
2-The ancient scriptures maintain that sound can also be perceived. How does one see a sound? Well, have you ever heard a piece of music in a dream? This particular dimension of sound, as it is in dream, is called pashyanti.
2-1-It may be called a mental sound, which is neither a conscious sound nor a semi conscious sound. It is a subconscious sound pertaining to a quality of mind