when I play my IV at even a remotely loud volume, even like loud just for playing at home..i can hear buzzin in the amp..it's just the volume of the 2x12 cab shaking the spring reverb in the amp, but still it annoys me, and kinda gets picked up recording...i've narrowed it to the nice big long, gold section on the bottom of the amp, end to end... that kinda sits almost below the amp just a tiny bit (what i believe is the reverb section?) anyway to fix this? or even verify that the gold thing is reverb? i never use it, maybe I could remove it?