Just picked up a new crystal slate call, and it's got the "sweet spot" patch from the factory. I'm just curious -- maybe the custom call builders can chime in here -- how is that "spot" determined? I mean, the entire surface is totally glass, in the beginning.
Again, just curious; the "sweet spot" on the call I just got sounds pretty good, but ... I've always conditioned the entire surface of my crystal/glass calls & used multiple "sweet spots" on mine...
Let me know; thx!
BGD