Prayer, which is the Shekhinah, ascends towards the King with ten ‘remembrances’, and with ten ‘coronations’, and with ten ‘trumpet blasts’, which are Yod-Yod-Yod י־י־י. And ten classes of angels become aroused towards them, and raise them towards the ten sephirot.
And the musical tunes ascend from them the angels, in quadrupled form, from the aspect of the cantillation note re-vi’a∞֗ through the four ḥayot (angelic-beasts), and they are: (Ps. 104:25)... creatures∞ḥayot small with large... They are eight, and they are Y-A-Q-D-V-N-Q-Y, and about them it is stated: Then (az, =8) shall Moses sing... (Ex. 15:1)