What role does Goddess Saraswati play in the first chapter of the Satcharitra, and how is she related to Sai Baba?

According to Chapter 1 of the Shri Sai Satcharitra, the author invokes Goddess Saraswati, the daughter of Brahma, for her grace in writing the book. She is described as the Goddess of Speech, holding the Brahma-veena, riding a swan, and being the Mother of the Universe and the Vedas. The author acknowledges that without her grace, no literature can be achieved and asks her to be the instrument to share the nectar of Sai's life. Similar to the identification with Ganesha, Chapter 1 also equates Sai Baba with Saraswati, stating, 'Sai himself is Goddess Saraswati, holding the Omkara-veena in hand, singing his own life story for the salvation of his devotees.'