Once upon a midnight dreary, while I pondered, weak and weary

Over many a quaint and curious volume of forgotten lore --

While I nodded, nearly napping, suddenly there came a tapping,

As of someone gently rapping, rapping at my chamber door.

" 'T is some visitor, " I muttered, "tapping at my chamber door--

                     Only this and nothing more."

Ah, distinctly I remember it was in the bleak December;

And each separate dying ember wrought its ghost upon the floor.

Eagerly I wished the morrow -- vainly I had sought to borrow

From my books surcease of sorrow -- sorrow for the lost Lenore--

For the rare and radiant maiden whom the angels name Lenore--

                     Nameless here for evermore.

And the silken, sad, uncertain rustling of each purple curtain

Thrilled me -- filled me with fantastic terrors never felt before:

So that now, to still the beating of my heart, I stood repeating.

" 'T is some visitor entreating entrance at my chamber door--

Some late visitor entreating entrance at my chamber door--

                     That it is and nothing more."

Cierta vez que promediaba triste noche, yo evocaba fatigado, 

en viejos libros, las leyendas de otra edad.

Ya cejaba, dormitando; cuando allá, con toque blando,

con un roce incierto, débil, a mi puerta oí llamar.

"A mi puerta un visitante -murmuré- siento llamar;

                              eso es todo, y nada más"

¡Ah, es fatal que lo recuerde! Fue en un tétrico diciembre;

rojo espectro enviaba al suelo cada brasa del hogar.

Yo, leyendo, combatía mi mortal melancolía

por la virgen clara y única que ya en vano he de nombrar,

la que se llama Leonora por los ángeles nombrar,

                                ¡ah por ellos, nada más!

Y al rumor, vago, afelpado, de purpúreo cortinado,

de fantásticos terrores sentía el alma rebosar.

Mas, mi angustia reprimiendo, me conforté repitiendo:

"-Es sin duda un visitante quien, llamando, busca entrar;

un tardío visitante que a mi cuarto busca entrar;

                         eso es todo, y nada más."

Modulation: Instead of a literal translation like “Érase una vez a medianoche lúgubre”, the translator uses “Cierta vez que promediaba triste noche”

Modulation and Reduction: “Pondered” becomes “evocaba” (evoked), which slightly shifts meaning but keeps the reflective mood. "weak and Weary" gets reduced to "fatigado".

Transposition and Modulation: The order of the sentence is different. The phrase “tapping at my chamber door” becomes “siento llamar” (I feel [someone] calling/knocking), shifting from a description of sound to a personal sensory experience.

Modulation: "Ah, distinctly I remember..." → “¡Ah, es fatal que lo recuerde!” Adds emotional weight by using “fatal”, which is stronger than “distinctly.”

Transposition and Adaptation: The order of the elements in the sentence change.  The name is adapated to Spanish.

Modulation: "Sad" becomes vague, and "uncertain" becomes afelpado (plush/soft). This replaces emotional tone with texture and atmosphere—modulation of sensory experience.

Modulation: “Thrilled me – filled me…” → “sentía el alma rebosar” The emotional reaction is modulated from physical to internal/spiritual.

Modulation: The phrase “to still the beating of my heart” is translated as “mi angustia reprimiendo”, shifting from a physical action to an emotional state. This is modulation (physical → emotional) and involves a change from an English infinitive to a Spanish gerund.