#1
(Pardon the title )

But I have been playing Funky Monks by the Red Hot Chili peppers, and when I play the bass outro I get like a 'twang' heavy vibration sound on frets 1, 2, 3 and 4. I know it's not the way im playing it because it sounded find last month, should I be looking to change my string?
#2
might be the nut?

it might be the way you're playing it if you hit the strings harder

or have you adjusted the bridge at all?
Rockin' shit
#3
Actually, the bridge has sunk a litle cause I do rest my thumb quite hard, that could be the problem
#4
Fretbuzz on low frets is good news. If you have fretbuzz in the middle of the fretboard then you have somethign to worry about. It's probably low action. Just raise your action abit. Or see if the string in the nut groove is too low. Then you probably have to get a new nut.

My action is way low and causes lotsa buzz but I dont mind. It's all a matter of preference.

I doubt it, but It could be your string as well. After a string gets old it loses it's elasticity, so the string may now be "sloppier" than before.
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