Okay, here's a very specific question for the Scots on Mudcat. One thing that I've noticed has to do with how the letter "r" is pronounced. Sometimes it's trilled - like the Spanish "r", and sometimes it's pronounced like an American "r". (I hope I'm making myself clear). I've listened very closely and found that the same speaker or singer sometimes pronounces the letter "r" with a "trill" or "burr" and sometimes doesn't. My question - is there any general rule about this? For example, there is a rule in Spanish pronunciation depending on where the letter r is placed in the word - it's always trilled but if it comes at the beginning of a word it's trilled more strongly, as is the case if it's a double r. I know this sounds nitpicking but I've been trying to figure it out. It's probably something that's done so unconsciously that it would be hard to identify a pattern to it, but any ideas?