Enochian angels are entities described in the Enochian magic system, introduced in the 16th century by John Dee (1527–1608) and Edward Kelly (1555–1597).
John Dee was dedicated to the newly formed Church of England (or the Anglican Faith), and this can be seen throughout his journals and his "Enochian" system of Angel Magic. Therein, we find an obvious belief in the Trinity (Father, Son and Holy Spirit). We also find a fourth Supreme Being in the figure of "Galvah" (Omega) — who is also called the Mother, Wisdom and "I AM" in Dee's journals. This figure is known in Judaism as the Shekhinah — Divine Presence; to the Gnostics as Sophia — Wisdom; and to the Hermetic Qabalah as Aima Elohim — Mother of the gods.
Beneath these four Divinities are several hierarchies of angels, or intelligent rulers, set over such things as the Planets, the Stars and the four Quarters of the Earth.
The angels of the four quarters are symbolized by the "Watchtowers" — four large magical word-square Tables (collectively called the Great Table of the Earth). Most of the well-known Enochian Angels are drawn from the Watchtowers of the Great Table.
YM2608, aka OPNA, is a sixteen-channel sound chip developed by Yamaha. It's a member of Yamaha's OPN family of FM synthesis chips, and the successor to the YM2203. It was notably used in NEC's PC-8801/PC-9801 series computers.
The YM2608 comprises four internal modules:
The FM Sound Source module includes six concurrent FM channels (voices, twice as many as the Yamaha YM2203), four operators per channel, with dual interrupt timers and an LFO. It also includes eight possible operator interconnections, or algorithms, for producing different types of instrument sounds.