Narapatijayacarya 2.2.17

Mars, Venus, Mercury, Moon, Sun, Mercury, Venus, Mars, and Jupiter,
Saturn, Saturn, and likewise Jupiter are the respective lords of Aries and the rest.

[On the verse] 'The a-sound' and so forth: Beneath the 'a'-sound, Aries, Leo, and Scorpio are to be written. Beneath the 'i'-sound, Virgo, Gemini, and Cancer. Beneath the 'u'-sound, Sagittarius and Pisces. Beneath the 'e'-sound, Libra and Taurus. Beneath the 'o'-sound, Capricorn and Aquarius. Having thus drawn them in the diagram, whichever lord belongs to whichever sign, one should write him beneath it. Thus, whichever planet is beneath whichever vowel, that vowel is to be understood as belonging to it; such is the meaning. (15, 16) [On the verse] 'Mars' and so forth: This is clear. Now, an illustration of planetary sounds: In Devadatta's name, the phoneme is 'de', and that 'de'—among the four quarters of the asterism Revatī [bearing the syllables] de, do, ca, cī—is the first quarter. By the asterism Revatī [is indicated] the sign Pisces, and that is beneath the 'u'-sound. The lord of the sign Pisces is Jupiter; Jupiter is the master of the vowel 'u'; therefore, Devadatta's planetary sound is the vowel 'u'. Likewise, in Sadānanda's name, the phoneme is 'sa', and that—among the four quarters of the asterism Śatabhiṣaj [bearing the syllables] go, sā, sī, sū—is the second quarter, having the nature of the sign Aquarius; its ruler is Saturn, standing beneath the 'o'-sound; therefore, for Sadānanda, the vowel 'o' itself is the planetary sound. Thus it should be applied everywhere. Thus conclude the planetary sounds.