I have been tweaking the Metal Zone for a while now and came across this information in the manual.

"When the middle LEVEL control knob is set to the center position, the middle FREQUENCY control knob does not affect the sound."

I am puzzled with what they mean by this. What frequency are you operating on when the LEVEL control knob is in the center?

Is it the frequency that was selected before the LEVEL knob was set to center, or is it a default frequency?
basically, the frequency knob changes the specific frequency that the middle level knob adjusts. but if the middle level is in the middle, its not adjusting anything, so changing what it would adjust does nothing

Ibanez RG7321 w/ D-sonic in bridge

Peavey 5150 mk ii & b52 4x12 cab

line 6 podxt for recording

Quote by AsOneIStand
Head and Cab for $130? You don't need a head and cabinet, you need a psychological examination.
the frequency nob changes which frequency the mid nob changes... if the mid nob is at 0 it's neither boosting not reducing the sound at that frequency, so it makes no difference what the frequency is
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i used to have one and theres no way id did that.