All EQ's function by altering the gain above or below normal over various frequency ranges. Some mixers offer "semi-parametric" EQ. This usually comes in the form of one or more cut/boost controls, each with a frequency control to position the cut/boost exactly where you want it along the frequency spectrum. One application of such a feature is in the fight against feedback. Here you would turn the cut/boost control counter-clockwise to produce a "dip" in the frequency response, then rotate the frequency control until the dip reaches the guilty frequency and the feedback is reduced.
The SWEEP control determines what range of frequencies is affected by the MID cut/boost. It moves or "sweeps" the MID control's peak or notch in response all the way up to several thousand Hz or down to below one hundred Hz. As a result it can have quite a noticeable effect on the sound especially since the MID cut or boost will be interacting with whatever cuts or boosts you may have set with the LOW or HIGH EQ controls. If you have set a LOW boost, a MID boost swept all the way down to the lowest frequency setting will alter the sound of lows AND increase their volume. As music plays through a channel on the mixer and speakers, adjust that channel's MID, first for a boost then for a cut and SWEEP them back and forth. (If there is no MID cut or boost setting, i.e. if it is set at the center position, the SWEEP will have no effect at all). Now repeat the process with that channel's LOW and HIGH EQ controls at various settings (but with the volume at a safe level for the speakers).
Most EQ sections include an optional High Pass Filter, which inserts a Low Frequency Cut at a pre-selected frequency usually at or near 80Hz. By invoking the HPF you automatically attenuate these lower frequencies. This feature can be very useful in cleaning up the mix by removing ambient low frequencies from open vocal mics.
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Experiencing Worship, The Study