In most applications, low pass, band pass and high pass filters try to totally remove a portion of the spectrum. For example, a low pass filter tries to eliminate all the high frequencies. But with the shelving filters, we are not always trying to remove anything - we are just boosting or cutting one portion while leaving the rest unaffected.
The frequency where the frequency response makes the transition between the two levels of gain (even though it may be very gradual) is called the cutoff frequency. You could design a tone control that let you change this cutoff frequency in addition to the level of cut or boost, but this is usually fixed at the design stage and cannot be adjusted by the user.
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