योभूच्चटचटाशब्दः स्फुटतो भूमिभागतः । तच्छब्दाद्व्यसृजद्वेधाः समाधिं क्रमतो वशी
yobhūccaṭacaṭāśabdaḥ sphuṭato bhūmibhāgataḥ | tacchabdādvyasṛjadvedhāḥ samādhiṃ kramato vaśī
अथ भूमिभागात् स्फुटः “चटचट” इति शब्दोऽभवत्। तच्छब्दश्रवणात् वशी वेधाः क्रमशः समाधेः स्वयम् उदतिष्ठत्॥
Skanda (deduced: Kāśīkhaṇḍa commonly Skanda → Agastya)
Inner awakening can begin from nāda (subtle sound), drawing the mind out of absorption into conscious insight.
The broader context is Kāśī (Vārāṇasī) in the Kāśīkhaṇḍa, where sound (nāda) and liberation-teachings are celebrated.
None explicitly; the verse describes a meditative-cosmic event (samādhi and nāda) rather than a concrete rite.