What does Fu Weng mean by reading my voice from the south window?

Fu Weng, the name of Huang Tingjian in his later years, is a poem in his "Three Chapters of the Song of the Examination Institute and Dr. Sun's Bamboo Window Play": "Reading sounds like me in the south window, and seeing the moon song" Zhi Zhu "in the north window. I asked the black magpie with white hair, and his red makeup took up spider silk. Five tones are onomatopoeic words here, which means that when reading poetry, the cadence is very emotional. Poetry generally means reading in the south window. When I go to the north window to see the moon, I can't help singing Zhi Zhu's poems.

Zhou Mi, a native of the Southern Song Dynasty, told an anecdote of Su Dongpo in Volume 20 of his note "The Sound of Reading": Once upon a time, someone threw a poem at Dongpo and asked, "Does this poem have a score?" Po said, "Ten points." He was overjoyed. Po Xu said, "Three points in poetry, seven points in listening." After finishing this anecdote, Zhou Mi commented: "Although this is a joke, Fu Weng (Huang Tingjian) said that' reading from the south window is my voice' is true, and the voice of a good scholar can be heard by himself." Indeed, Su Dongpo in the anecdote just said that the man's poem was not good, but he recited it well. However, it also shows the importance of recitation to poetry.