Hello, Jon, it is a pleasure to receive your meditation question. You are welcome to ask such questions on the forum (fruit of the contemplative life). You will note that I moved this topic to Meditation Techniques, which had not been made active yet.
Basically, the meditation object, such as the breath, is only a vehicle to the charisms, such as the sounds and sensations you described. So, once those sounds and sensations arise, then it is time to dump the meditation object and bring your attention to the sounds and sensations as your new meditation object.
If the sounds and sensations disappear and internal dialog reappears, then do return to the meditation object until the sounds and sensations (charisms) reappear, then go back to the charisms as your meditation object. This is true for throughout the day as well.
Your goal, as a mystic, is to saturate your awareness with the various charisms 24-7. If you do, then you will be transformed by this practice.
The sensation between the eyes is known as opening the third eye. The third eye is also the 7th chakra.
The charismatic sounds one can hear in meditation is known as the "divine ear" in Buddhist literature. Most mystics report hearing various sounds. Terese of Avila wrote about these sounds:
The Interior Castle, St. Teresa of Avila,
Pg 93) “As I write this, by the way, I can’t help but wonder what’s going on inside my own head. Those noises I told you about in the beginning are getting so loud that it’s almost impossible for me to obey the order to write this. It sounds like there are a multitude of rushing rivers inside my head, their waters cascading downward, surrounded by many little birds and other whistling sounds. This is all unfolding not in the ears but the upper part of the head, where they say the higher part of the soul resides. I have spent long periods in these regions. The spirit seems to push its way upward with great power and speed…all of this turmoil doe not hinder my prayer or interfere with what I am trying to say. Instead, my soul is whole within its quietude, its love, its longing, and its clarity of consciousness.”
translation and introduction by Mirabai Star. Riverhead Books, Published by the Berkley Publishing Group a division of Penguin Group USA Inc. 375 Hudson Street, New York NY 10014, 2003
Best regards, Jhananda