| Ahh, just tended to this problem myself.
I have one guitar that I keep in "drop C" tuning for metal type tracking, a Hamer Chapperral elite w/ sustainiac, and found when doing tight choppy rythems, the springs rang out, making it not so tight sounding.
My solution was to stuff a bit of "natural" fibre wall and cieling insulation (the white, non itchy stuff. Just happened to find some lying around) in the cavity. Has worked a treat. I suppose you could use anything similar.
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Every day I learn something new (with a little help from my slutz), and that keeps me going.
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