t.b. blowbending- any advice?

[Marion.Spiers@xxxxxxxxxxxx]

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I'm hitting a wall here, I can blow bend comfortably with the "u-groove" 
and have control and tone, but I want to be able to tongueblock 'em too. 
Where do I find it? I already t.b. everything else. I can t.b./blowbend on 
the chromatic. I play softly from the gut and shoot for control with my 
throat. Any tips or excercises appreciated!

kcmojoe