ki/Band-pass_filter">bandpass filter</a> that removes frequencies lower than a selected low cutoff frequency, and higher than a selected high cutoff frequency, can be defined (using the already described <code>fi.lowpass</code> and <code>fi.highpass</code> filters): </p>
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import("stdfaust.lib");

process = no.noise * hslider("noise", 0.5, 0, 1, 0.01) 
: fi.highpass(3, hslider("lowfreq", 4