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The response of a force-balance system is approximately inverse to the gain of the feedback path. It can easily be modified by giving the feedback path a frequency-dependent gain. For example, if we make the capacitor C large so that it determines the feedback current, then the gain of the feedback path increases linearly with frequency, and we have a system whose response to acceleration is inverse to frequency and thus flat to velocity over a certain passband. We will look more closely at this option in section