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From the FAQ page on this quan yin cult homepage:
Q: Master, Why is it seeing light and hearing sounds so important in
meditation?
M: Because that is our own real self. Light and sound is the
manifestation of our wisdom inside, which is invisible to our eyes and
ears. Hearing the sound doesn't mean you hear with the ears. Seeing the
light doesn't mean you see with eyes. It's just the inside awareness of
your own self, of your own glorious nature, that we are light; that we
are a beautiful melody and that we are not the body. And the more you
hear of this invisible, inaudible sound, the more you'll see this
invisible light or heaven, the wiser you'll become; the more loving
you'll become; the more satisfaction you'll gain; and the more
efficient you will be to serve the world.
Invisible light.... Agency,..uhummmm