The Spanish voice has an interesting accent: 85% Castillian (from Spain) pronunciation, with a few unexpected Latin American tonalities and phonemes (especially

The Spanish voice has an interesting accent: 85% Castillian (from Spain) pronunciation, with a few unexpected Latin American tonalities and phonemes (especially "s") sprinkled in. I guess it's what you'd expect from averaging a large amount of public-domain recordings. I think there's a bias towards Spain vs Latin America due to socioeconomic reasons, the population is obviously much smaller.