• bhūta-bhāvanaḥ — the origin of all creation
  Compound: bhūta (beings) + bhāvanaḥ (the originator, the one who brings into being). One of Bhagavān's standard names (Gītā 9.5, 10.15). Gauḍīyas read this name as the personalist counterweight to Advaitin 'unmanifest source' — bhāvana is an active, willing Person, not a substrate.
• prahasan — smiling broadly
  Present participle of pra-√has. Bhagavān's smile precedes His teaching, just as it does in Gītā 2.10 (prahasan iva). Vaiṣṇavas read this smile as the Lord's signature mood when about to disclose Himself.
• vāṇyā — with words
  Instrumental of vāṇī — speech. The Bhāgavata's whole theological tradition is downstream of Bhagavān's vāṇī — Gītā, Uddhava-gītā, this chapter. Vāṇī is not metaphor; it is mediated revelation.
• megha-nāda-gabhīrayā — deep as the rumbling of clouds
  Compound: megha (cloud) + nāda (sound) + gabhīrayā (deep). The same ghana-vocabulary that named Kṛṣṇa's complexion (verse 23) now names His voice. The image-cluster is consistent: Bhagavān as the dark-blue, deep-voiced thunder-cloud — Vraja's image, in cave-light.

• Where do you imagine Kṛṣṇa's voice as flat when scripture gives it depth?
• How could imagining specific tone improve your reception of His words?

After the bhakta has spoken, the Lord smiles and replies with a voice like distant thunder — not loud, but felt in the chest. The Bhāgavata-poet stages the answer: deep voice, broad smile, all aiśvarya, all kindness.