Dying with a Dying Fall....

"I know the voices dying with a dying fall / Beneath the music from a farther room".  These two lines seem to have an almost musical quality to them. If one were to read these two lines aloud, one might be able to pick up a rising and falling rhythm. Along with this musical rhythm the word "music" is actually referred to thus solidifying a reference to something beyond the mere words on the page, to something more artistically abstract. Emotionally, these two lines are quite somber and downcast. He repeats dying and follows it with "fall" and "beneath" which coincides with the rising and falling rhythm I referred to previously. It is as if the music is the ideal place put the general "voices" cannot rise into this place and instead fall with a "dying fall" beneath the place of music.  Additionally, music could also be taken as a direct reference to an emotion of some sort.
He states that he "knows" the voices who are falling beneath the music. However, it is not clear whether he is part of these falling voices or if he has achieved the ideal of music.