After restringing from 10´s to 9´s all lower open strings E A D buzzing at the first fret. For the moment I was put in the slot of the saddle a small piece of paper to rise up the string. But I`m not happy with that solution. What to do?
I think you need to adjust your truss rod a little. Turn the wheel counter-clockwise a little.
From the Ernie Ball FAQ:
Q: What is the best way to adjust the action on my Music Man guitar?
A: The best and easiest way to adjust your action is to use the truss rod. To lower your action, turn the wheel clockwise. To raise your action, particularly if you have fret buzz, turn the wheel counter clockwise. It is always a good idea to make just one or two turns at a time, then play it and see if it needs more adjustment. It normally doesn't take many turns of the wheel to notice a difference.
A "turn" as defined here is inserting an adjustment tool and moving a spoke of the wheel from one side of the opening at the body at the neck to the other side.
Agreed
Going down from a 10 - 9 means that the tension of the strings are no longer as great as before. Adjust the truss rod a tad and it should be fine.