From the LTI Korea website:
They(Poem) were born as part of a larger project, titled “The Future of Voice.” That is why I begin each poem with a sound effect, indicated by an international phonetic character, instead of simply adding footnotes.
I hope that the sound, born in another time-space than the visiblbe(legible) screen(writing), has an unutterable effect on your own creativity.
Source: Poet’s Note in Book
Hard to obtain outside of Korea.