Spanish and Italian _r_ and _rr_ -- for my Romlang #3

This may seen like YAS/IPT, but I'm actually looking for design info for my as yet
unnamed Romlang. I know that Spanish and Italian /4/ and /r/ contrast only
between vowels; elsewhere the single spelling _r_ represents both phonenes,
distributed according to rule. I *seem* to remember that the rule is [r] before
vowels and [4] after vowels, but I'm not sure, especially not about what
applies word-finally. Also I don't know whether the same rules apply in both
languages.

And what about Catalan, Provençal and Portuguese? I think that in the first two
only /r/ has become /R/ while /4/ remains, and IIRC the same is the case in
some dialects of Portuguese. How is the actual case with this, and again what
is the distribution?

Brought to you from the bus. A first for me, so I hope it works!

/BP
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