Found! https://www.cambridge.org/core/journals/journal-of-the-international-phonetic-association/illustrations-of-the-ipa

Dear Vita:

I suggest you to visit this website:

http://dialectos.osu.edu/

Professor Piñeros recorded a large number of spanish speakers from all the world. Each one recorded freely some thoughts about his childrenhood, literature preferences, etc, but ALL of them recorded also the exact same text, a spanish version of "North Wind and the Sun"; you can find the audio-video recording, and a narrow phonetic transcription of all these recordings.

I hope this information can be useful to you.

Best regards (and sorry for my "horringlish"),

Félix Fernández de Castro

Universidad de Oviedo