I am not an expert really so you'll have to fill in the blanks. I learned from a Co sligo Flute Player who showed me how to play with my feet (I ain't jokin) I began right and stayed that away.

Mary Bergin has several recordings out go www.amazon.com for the CD refs.

You are probably asking bout 'triplets' which I do not do on whistle but are similar to the ones on the Chanter which I can do but rarely use. Confused yet:) The idea is to finger the opening really quickly three times. D d d sound. Then when you get that off well you can incorporate it into a roll or turn.

I strongly recommend you to find a record of Miko Russell of Co Clare Ireland who has recorded Irish Trad Tin whistle the way I heard it played as a child. Now I am not saying that is the best or only way - just that it is a great way to play the tunes so you get the hang of counterpoint. My Grandfather was a Fiddle player and he called that 'Turning the Tune' he meant Counterpoint of course not a roll. There is a lot of confusion on this issue.