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Well, there is true parametric and quasi-parametric. With a true one you basically choose a center frequency (say one that is peaky) and then adjust the Q which is how wide of a bandwidth you want to effect and then you choose the level of boost or cut. A narrow or low Q would effect a very narrow range of freqs and look pointy while a wide or high Q would effect a wider range of freqs and look like a short pyramid. They are quite a bit more complicated to use so you don't see many people using them. Proper calibration can be quite detailed and I don't have much experience tuning with them so you would probably have to look online for that information.
BTW, the quasi-parametric does not goive you Q control, just the center freq and the level control.
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