• brahma-ghoṣeṇa — with the sound of the Vedas
  Compound: brahma (the Veda) + ghoṣa (sound). The Vedic śabda is itself a form of Bhagavān (śabda-brahman). Gauḍīyas treat correct Vedic recitation as a body of the Lord — never mere ritual noise.
• deva-ṛṣi-pitṛ — demigods, sages, forefathers
  Triple compound — three classes of unseen guests at every sacrifice. Their pleased presence (signaled by the flower-rain) confirms the yajña is valid.
• tuṣṭuvuḥ — they recited praises
  Perfect of √stu. Stuti is the natural overflow of seeing dharma succeed. The Gauḍīya frame: when a Vaiṣṇava king is honored, even the demigods become kīrtaniyas.
• puṣpa-varṣiṇaḥ — raining down flowers
  Compound: puṣpa (flowers) + varṣin (raining). The unmistakable Purāṇic sign of cosmic approval. Heaven votes by petal-fall.

When Vedic mantras sound and flowers fall from above at the same instant, the two worlds — earthly and celestial — are momentarily transparent to each other. Bhakti makes this porousness ordinary; the yajña makes it visible.