found this on a site I don't know if it can help:

 

Meditation — PARASYMPATHETIC REJUVENATION
(K.R.I. Level One Teacher Training Manual, pp. 204-205, Given by Yogi Bhaj=
an, Ph.D., 11/
2/78)

 

Posture:  Sit in Easy Pose.  Make the spine erect, straight and comfortable=
.  Equalize the
tension in the body so that both sides feel equal.  Tuck the lower spine fo=
rward, but do
not force it.  Relax the arms and elbows. 

Focus:  The eyes are closed, looking upwards into the third eye point.  Vi=
sualize and
sense the entire body simultaneously.

Breath:  Focus on the flow of the breath.  Let it become slow and meditativ=
e.  Start with
even deeper complete yogic breaths.  Then let the breath gradually become l=
ighter and
more meditative.  It should breathe itself once you fully concentrate and b=
ecome still.

Mantra:  The mantra for this meditation is the sound of the gong.

Mudra:  Place the hands on the knees with the palms face down.

Time:   Continue for 6 to 31 minutes. 

End:  Inhale, hold briefly, exhale and relax.  (If the gong is played 11 m=
inutes or longer,
do not drink any water for a half hour after the meditation.)

Comments:  As you listen to the gong's sound, it will penetrate every cell =
and fiber of your
body.  At times it can seem frightening or overwhelming.  Emotions and thou=
ghts are
provoked from the subconscious.  The entire nervous system is put under a p=
ressure to
adjust and to heal itself.  When that pressure builds, totally relax in the=
deepest meditation
possible.  Surrender the mind and body.  The sound will carry you beyond al=
l fears.  The
pressure will release the nervous system of many illnesses.  Feel you ride =
the sound into
the Infinite itself. 

The parasympathetic nervous system is ruled by sound.  The sympathetic ner=
vous system
is ruled by vision.  It is the sympathetic system that needs to be regulate=
d.  When it
triggers too often and in the wrong regions of the body you can be greatly =
weakened.  The
parasympathetic regulates the sympathetic, but it is weakened by drugs and =
by poor
health.  To regenerate the parasympathetic system, nothing is more powerful=
than the
gong.

This meditation will clear the nerve endings and make you very sensitive to=
the motions of
prana and to the effects of sound.  The restriction on water if you listen =
to the gong for 11
minutes or longer allows the sympathetic and parasympathetic systems to int=
eract with
each other internally rather than turning their energy to another task.