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+#X text 124 387 <-- cutoff (pitch units);
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+#X text 348 582 updated for Pd version 0.39;
+#X text 88 459 low-pass filter;
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+#X text 408 528 --- 0.02 sec ---;
+#X text 28 30 This and the following patches show how to use filters
+in Pd \, starting with the simplest one: the one-pole low-pass filter.
+Here we test it with an input of white noise. The lop~ object does
+the filtering. Its left inlet takes an audio signal to be filtered
+\, and its right inlet takes messages to set its cutoff frequency in
+Hertz.;
+#X text 26 129 The lop~ object is normalized to pass DC (the lowest
+frequency) with a gain of one. Higher frequencies are progressively
+more and more attenuated. The lower the cutoff frequency \, the lower
+the total power of the filtered noise. If you graph the output you'll
+see that the waveform gets smoother (and smaller overall) as the cutoff
+frequency is lowered.;
+#X text 28 243 At the cutoff frequency the gain is about -3 dB \, and
+above that the gain drops a further 6 dB per octave. (Sometimes one
+uses the word "rolloff" instead of "cutoff" to emphasize the gradual
+way the gain drops off with frequency.);
+#X text 108 353 white noise \, test signal;
+#X text 185 6 ONE-POLE LOW-PASS FILTER;
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