#1
So I'm thinking about getting the Marshall Jackhammer JH-1 pedal, and I noticed that there's two controls that read "Frequency" and "Contour"

What exactly do those controls relate to tone-wise?
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My Gear:
-Fender Mexican Stratocaster
-Silvertone Paul Stanley Signature Acoustic
-Fender Princeton 65w
-DOD Death Metal
#2
The contour is for scooping the mids and the frequency allows you to adjust what frequencies are being scooped.