Góngora wrote the Dedication (to honour his sponsor) after he had finalized a consirable part of the Soledades. Some critics interprete the first line as follows:
Pasos de un peregrino son errante
The footsteps of a wandering pilgrim sound
I do not agree with this interpretation. Góngora could have written Pasos de un peregrino son errantes, but this would have been too predictable. (Did he indicate son errante or peregrino errante?) From his travels on his mule he would have known that pilgrims do not produce sounds at all. Anyway, what becomes clear in the Dedication is that he only transmits the versos, not the pasos. (The pilgrim in the main part is not the same pilgrim as the one in the Dedication).
However, Góngora does produce sound in his poetry, in particular with the vowels.