For specifics on Welsh pronunciation I recommend any interested learners to check out the FREE BBC Big Welsh Challenge video course at:
http://www.bbc.co.uk/wales/learnwelsh/b ... challenge/
The information is in the "Helpful Notes" section under any of the lessons.
If you're interested in learning to speak Welsh, I recommend that you forgo the Big Welsh Challenge video course and instead try the "Say Something In Welsh Audio Course". This course also provides both dialects: North and South and it focuses on using Welsh and speaking it, rather than memorizing words and translations. Trust me, you'll get much further and feel more confident with this than the BBC course.
Hope this helps you all.
Austin, Texas, USA