This then is how the second ātmā , the individual self, aham that is other than the Creator forms in the womb, mātā and the next shlöka I.2.4 says in the beginning : sah akāmyat dvitīyo ma ātmā jāyeti, sa mansā vācam mithunam….
The mana or the mind reflects from the ādityam and the vāca arises from the prāna ( or agnī-vāyu combine) and the whole play of māyā commences….
This is how the shaktī chakrās of the sūtra I.7 start getting framed.
……. ‘a’ is the whole of speech and being manifested through the mutes and the sibilants it becomes manifold and various. If uttered in a whisper it is this prāna, if forcefully, that body – śarīra. Therefore it is hidden, as hidden as the previous body encapsulated in this prāna . But spoken forcefully it is that body and visible, for body is visible.
Now â ( A ) is the immutable, the symbolic Unknown – if this is the whisper, then as we force the breath just a little, what we get is its aspirate sound ah ( A: ) which is the visarga sound. Technically it is not included in the alphabet and is termed ayogavāh or ‘that which is not part of the harness’.