The R in Roberto can be soft like a Spanish J, or it can be pretty hard, albeit with the back of tongue bouncing off the palate rather than the tip, depending

The R in Roberto can be soft like a Spanish J, or it can be pretty hard, albeit with the back of tongue bouncing off the palate rather than the tip, depending on many factors - local accent, the speaker's mood or energy level, etc. Mind you, to us it will still be the same phoneme, just at different "softness" levels. In other accents, the tip of the tongue is used in the same fashion as in Spanish. This is especially present in border regions. In other regions, that R is a single hit of the tip of the tongue, especially around Italian and German colony regions, similar to what a single R in the middle of a word typically sounds in Portuguese.