The Upanishads, Part 1 (SBE01), by Max Müller, , at sacred-texts.com
1. Next for the sevenfold Sâman. Let a man meditate on the sevenfold Sâman in speech. Whenever there is in speech the syllable huṅ 1, that is hiṅkâra, pra is the prastâva, â is the âdi, the first, i.e. Om,
2. Ud is the udgîtha, pra the pratihâra, upa the upadrava, ni the nidhana.
3. Speech yields the milk, which is the milk of speech itself, to him who knowing this meditates on the sevenfold Sâman in speech. He becomes rich in food, and able to eat food.
26:1 These are again the stobhâksharas, or musical syllables used in the performance of the Sâman hymns; see p. 22.