Hey tom
"top stick" triplet as a true triplet. Is it? Or is it an after-effect of a slightly over-rotated down stroke?
Many people just use the standard kerry triplet no matter whether they are playing top or Kerry. With top end, it's just a matter of dropping your hand low enough so the top of the
Tipper can strike the skin. You can see johnjoe do this on the
solo video
The single stroke triplet / roll is different in that it is not forced to be a triplet pattern as it is with Kerry; instead, any combination of strokes is theoretically possible. These are accomplished usually simply by speeding up the hand stroke. You can see
Eamon Murray using it extensively.
One of the main effects on a player is that after executing a single stroke roll you will sometimes be left playing 'upside down' so your first beat starts on the upstroke. A major advantages of the double down is that it can correct this instantly. The two things don't have to go hand in hand but it certainly helps.
The double down roll uses the grace upstrokes between the two downstrokes to add in an extra fill e.g. D.D.U. becomes DuD.U. In a jig this usually sounds pretty normal but in a reel it gives a fast triplet feel that carries easily over the barline
The double down roll can be combined with Kerry style triplets do DuD.U becomes DtuDt.U. It sounds fast but is often messy.
The problems I experienced when developing these kinds of skills in my hands are that although I could plysically do the movements, it is difficult to keep consistent contact of the stick on the skin without scraping across lightly or missing it altogether :) Some days I'm better than others and being warmed up certainly helps. The bell and the practise pad really help too but their curved striking area is much easier to hit than the flat plane of a drum skin, you can hear the accuracy difference when I'm hitting the matchbox although a biro is simply for illustration and definitely not my favourite tool
It's a bit like all of these things, a little exploration goes a long way toward opening doors that lead to other rooms. I rarely play on the top end in sessions, when I did play it was usually me and Paul Phillips so he took the top and I took the bottom. The egg drum just sounds so awesome down there that I'm becoming a bottom feeder, I'll leave the top end stuff to you young'uns bearing tippers with go faster stripes, alloys and fog lights lit on a bright evening.
HTH
P