This module is designed to help memory work by allowing a reader to see a selected passage of literature letter by letter, word by word, line by line, clause by clause, or sentence by sentence. If the text is a poem written in stanzas, like most of Horace's Odes, you may also proceed stanza by stanza. The Paragraph function is mostly for prose and epic, and should not be used when reading Horace. (I am still working on that.) Pressing the '1', '2', or '3' button next to the 'Letter' label will give you 1, 2, or 3 letters, and the same is true for other units. The last bit added, which may be anything from 1 letter to a page or more, will be in blue to help you see just how far you have advanced.
A little practice will show you how it works.