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Parametric equalizers are the most versatile equalizers made. All four parameters of equalization (filter type, gain, center frequency and bandwidth) are adjustable so there are no ranges of sound that cannot be changed wit h them. The lesson and drills for this computer demonstration use parametric equalizers. The first two lessons feature hi pass and low pass filters to remove unwanted rumble and hiss. The nest two lessons demonstrate the shelving filters common in tone controls. Peaking (or bandpass) filters are next. They are useful to control ringing and feedback. Peaking filters have adjustable centers and widths, making them the most flexible type of equalizer setting.