Well, first let me say that the Low G is very different in bore diameter and reach than the Low D. That would be the case with any make of whistle. So Ronaldo’s suggestion for the Low D wouldn’t apply to the Low G according to the way I play. The subject of a switched up grip might be interesting for a new topic anyway. You should get more opinions than just mine.
Then let me offer this link.
http://www.chiffandfipple.com/pipers.html
On low whistles starting at Bb I mix it up quite a bit. Meaning, every time I use a piper’s grip, I mix the pad between the end and second joint up with one or two end pads, and sometimes even throw in end joint crease if it seals correctly.
So if a proper pipers grip was all holes sealed with the pad between the end and second joint (and to be honest, I don’t know what a proper piper’s grip is) then I always modify the grip (one way or another) to play a low whistle.
Note that I don’t put the bottom pinky down on the whistle body to stabilize the whistle on a C#. Instead, I cover the end tone-hole with the 3rd finger on my bottom hand like 000|00X.
On my Reyburn Low D I play all tone-holes with the pad between the end and second joint, except for the bottom hole (the only one offset on my whistle) which I play with the end pad of the 3rd finger of the bottom hand. I tried the pinky thing, didn’t work for me.
On my Reyburn Low F I play all tone-holes with the pad between the end and second joint.
On my Reyburn Low G I play the index and middle finger tone-holes (both hands) with the pad between the end and second joint, and I play the 3rd finger tone-holes on with the end pad.
On my Reyburn Bb I think I play the top hand with the pad between the end and second joint, and the bottom hand with a standard whistle grip (don’t have it here to try).
I imagine everyone that plays different keys mixes up the grip for whatever works best for the whistle. Now I have a pretty good imagination, so I could be wrong. But I play the my Overton Low D differently than the Reyburn, and I played my Burke Low D differently than the Reyburn and Overton if I recall correctly (I sold the Burke some time ago).
King Friday would be a good one to ask as well. He just received a Low D (no offsets if I recall correctly) so he may have switched up his grip a couple times to find his particular groove with that particular whistle.
Oh yeah, Doc. I bought the Low F used. It’s Ronaldo’s old school wide bore. Amazing power and voice - like a trumpet or interstellar sonic laser, or something. 