i've got two queries 1.the D string on my acoustic has a buzzing sound when played open!! any suggestion how to get it back to the normal open D sound?? i've tried loosening the string n tuned that back but the buzzing sound is still there.... 2. i want to get a pick up for my acoustic so that i can connect that to an ampli(or a hi fi system?) sth like http://img3.musiciansfriend.com/dbase/pics/products/0/4/0/246040.jpg or like http://www.amazon.com/Acoustic-Guitar-Soundhole-Pickup-Pick/dp/B000EVD3QS how much will that cost? ie i want an average quality one ... any suggestions?