It may be the thickness of the pick you're using. A thinner pick makes a clicking sort of sound, depending on the attack, which is the way you hit the strings.
It's hard to know exactly which sound you mean, but a few more details and we can help figure it out for you.
JD
Latest Tutorials
Bending The Flat 7 To The 1
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Hybrid Picking Progression In A
Double Stop Progression In A
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Behind The Nut Bends On The G String
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Latest Tutorials
Bending The Flat 7 To The 1
Chicken Pickin'
Hybrid Picking Exercises: One Finger
Hybrid Picking Progression In A
Double Stop Progression In A
Crosspicking Combinations
Behind The Nut Bends On The G String
Behind The Nut Bends On The B String
My Lessons
http://www.youtube.com/jdfenderbender
myspace.com/jdjarrell
myspace.com/guitartrickscountry
twitter.com/jdfenderbender
facebook.com/jdjarrell