I noticed that i have a buzzing sound when i pluck my 3rd (D) string open. Also...i play thru a SWR750 head and SWR Golaith III and i dont notice any distortion. Recently i went to record at a studio. I was plugged in directly and i noticed that the sound was very distorted. How can i fixed this problem. ( i havent changed my strings in a yr. i play an avg of twice a week).