Should you desire to create a specific type of spiritual energy, you can select the note associated with that chakra and focus your attention and thoughts to create a specific type of spiritual energy. You can review the grid and determine what type of spiritual energy you desire and use that note to help create that spiritual energy.
You use the sound and concentrate on the sound to the point where you are able to reduce the physical desires and feelings you may have by sitting in one position. You may decide you are more relaxed if you close your eyes when you concentrate the sound (such as a bell or a single chime). This will require intense mental concentration which seems to be a contradiction, but it works. The more you concentrate on the sound, the less the mind thinks about others and so you induce a state of self hypnosis as you may think of it. Once the mind is distracted and occupied, then the soul feels freer. The soul can create spiritual energy for that specific chakra associated with that note.
Should you be able to go into a trance while concentrating on the sound, your soul may be able to wander (such as visit the astral plane and commune with your Higher Self) as well as explore.
Below is the sound of "B" over a 10 minute period, in 7 different decibels, you can use for a sound meditation, for your 7th chakra. (Sound produced by Mitchell Lee.)