Thread: /r/ vs /r~/

Quick question...

what is the difference between pronunciation of /r/ and /r~/? as in the r with the tilde on top??? i think that it is present in Puerto Rico... but I can't quite tell the difference between the two...

There is no r with a tilde on top in Spanish.

As Exxcentrica has said, there is no r with a tilde on top. But, if I am not confused, you are asking about the different pronunciation of the r in Spanish. You pronounce previo (and the r is soft) and carrera (double r much more strongly). The double r is never written at the beginning of a word, for instance, you say raro, the first r is stronger than the second one.
I hope it helps you.

I don't know which sound /r~/ stands for. Maybe it is what is called "rotacismo", an /l/ pronounced pretty like an /r/: "er niño" instead "el niño", what is common in popular Spanish, some places in the Caribbean and Southern Spain.