Śaiśirīya Śikṣā 86

86

yatra yatra sthitā vāṇī pāṇistatraiva tiṣṭhati
uccau niṣādagandhārau nīcāvṛṣabhadhaivatau

Wherever the voice rests, the hand rests precisely there; / niṣāda and gāndhāra are high; ṛṣabha and dhaivata are low;