hi prana i responded to your e-mail but here goes about the sounds.
Basically we are all made up of energy rite ... now everything in this world can be quantified as a wavelength light / sound etc , also in the spectrum of wavelength we cant see is energy , so it is possible to measure chi , with a chi- o - meter ... i know it sounds corny but anyhow.
If this wavelength of energy were also translated into a sound it would release a certain frequency, basically as the pure current of energy shabd or logos or tao or whatever comes down from the higher realms it reverberates and this reverberation is like a thunderclap ripping asunder the clouds only this doesnt rip asunder the higher planes instead it fills them with music , like the sage pythagoras says music of the spheres.
When it filters lower to the astral plane this energy creates the reverberations which filter through into the chakras , if you go inside to the astral plane and listern to the sound of the crown chakra it actually makes the sound aum.
in essence it just sounds like aaaaaaaaaaaaaaaaaaaauuuuuuuuuuuuuuuuuuuuummmmmmmmm mmmmmmm
and it reverberates, thus when you make this sound with your physical body you tune in to the frequency of aum and it makes your crown spark......
simple but effective, in a way though its low level because you are physically bringing through a fake version of the inner sound.
originally it was done to remind people of the sounds you should look for , nowadays people have lost it so they just chant aum, same as the bell sound in temples it used to be played to remind people of what they seek inside, however this was *******ised so people hit the bell and think they are going inside
the church kills it one step further by having the people go to the church and get holy light by lighting up a candle
take care
it is not the physical force which inspires the fear that makes men sick of
soul so much as that which comes from the eyes, some subtle emanation from the personality as a gas that takes the strength from men's limbs.