Hi guys,
what is this technique in whistle playing, and how to practise it? Happens around 1:05 - https://www.youtube.com/watch?v=tLE8fSzY7To
Many low whistle players use it, sounds great.
I think it’s a crann.
I don’t think there’s a crann there, if I am listening to the same bit anyway. Simple grace note : ..{eg}e2 d2|B
he is using the same technique multiple times in the intro… 
1:08 is the next.. maybe triplet?
I think Mr.Gumby is right. Not a crann. Might be a quick roll however. Or just a cut. There is a number of different things you could do at that point in the tune.
It’s a doubling - two gracenotes played on the E melody note, in this case probably played with the A and G fingers.
A cran would have three gracenotes.
How to practice - as with everything else, first of all, practice SLOWLY…
play E, cut with A, back to E, then with G - don’t lift the G finger before the A finger has been closed and the second E sounded - you want to hear E - A cut - E - G cut - E. The execution needs to be very precise, so start slowly and the speed up, the effect comes with tempo but first of all precision, or it will never sound right…
It is very much like a cran missing one gracenote, the desired effect being the illusion of the E sounding throughout, with the grace notes being dabbed onto it
Basically, it’s a triplet, plus the cut being added to one of the notes at the same time.
I think it’s exactly the same ornament I do quite a bit.
I do it on E in the 2nd octave.
It’s a double-cut, like this:
xxx xxo
xxx oxo
xxx xxo
xxx xoo
xxx xxo
I do exactly the same thing with my upper hand:
xxo ooo
oxo ooo
xxo ooo
xoo ooo
xxo ooo
On either hand, it’s cutting first with the index finger and then with the middle finger.
I suppose it could be called a “semi-cran” because it has two cuts while what I think of as a “cran” per se has three cuts.
Not a “triplet” at least not in the sense of a melodic device as the term is usually used in Irish and Scottish music.