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?
My You'll be the Baddest Dude in Revere!

My Gear:
-Fender Mexican Stratocaster
-Silvertone Paul Stanley Signature Acoustic
-Fender Princeton 65w
-DOD Death Metal
The contour is for scooping the mids and the frequency allows you to adjust what frequencies are being scooped.