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This paper deals with the acoustic analysis of the simple trill [?] and the multiple trill [?] of Spanish (L2) carried out by an informant of the Ngäbere language (L1). An attempt is made to determine, through the voice analysis program Praat, which phonetic realizations of the trills are observed in the oscillograms and spectrograms of the Ngäbere speaker when faced with the pronunciation of a native speaker (control). This single-informant study may provide answers to new research, but never to definitive results and generalizations. The method used is the experimental one studied by Llisterri. This work will be based on theorists such as Navarro Tomás, Antonio Quilis, Martínez Celdrán and Alvarado Ricord, among others. The results obtained show changes in the pronunciation of Spanish that affect the pronunciation of [?] and [?] and open the way to infinite investigations of different topics in the field of phonology and phonetics.