The sound of bells and the seeing of lights and colours are signs of the opening of the inner consciousness which brings with it an opening also to sights and sounds of other planes than the physical. Some of these things like the sounds of bells, crickets etc. seem even to help the opening. Bells heard are usually a sign of progress in sadhana, progress to come.
When the psychic being comes forward all is happiness, the right attitude, the right vision of things. Of course in one sense it is the same I that puts forward different parts of itself. But when these different parts are all under the control of the psychic and turned by it towards the reception of the higher consciousness, then there begins the harmonisation of all the parts and their progressive recasting into moulds of the higher consciousness growing in peace, light, force, love, knowledge, Ananda which is what we call the transformation.
There are three stages of the sadhana, psychic change, transition to the higher levels of consciousness — with a descent of their conscious forces -- the supramental. In the last even the control over death is a later, not an initial stage. Each of these stages demands a great length of time and a high and long endeavour.
Unshaken her will pressed on the rigid bars:
The gate swung wide with a protesting jar,
The opponent Powers withdrew their dreadful guard;
Her being entered into the inner worlds.