Chris Thile produces a wonderful round tone with this grip:
It is the same grip that Marla Fibish likes, at least she told me that in a skype lesson. I'll find out in October at the O'Flaherty Retreat (http://www.oflahertyretreat.org/) when I take her class.
The grip should be very light - the natural connection of the thumb and first finger at rest is enough to hold the pick as long as you have your thumb and finger there to counteract the force against the strings. You should not lose your pick that often with this grip.
Thile holds his pick perpendicular to the body of the instrument but at an angle to the strings in the horizontal plane in order to get a rounder tone. It is harder to describe the system than to show it and he does so in this video about half way through:
I've started to use this grip and tried to stay as loose as I can (which Enda and Martin also preach) in order to keep the tone and play the ornaments. It is a lot of hard work but I am slowly getting there.
I like this grip and it seems to like a lot of mandolins.
Mike Keyes
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