Added about 64 files that I hadn't realized weren't in the CVS

repository.  Threw in pd/portaudio/pa_win_wdmks for good measure, although
I haven't tried compiling that in yet (no windoze machine handy today).

svn path=/trunk/; revision=4316

1 files changed, 74 insertions, 0 deletions

diff --git a/pd/doc/3.audio.examples/H13.butterworth.pd b/pd/doc/3.audio.examples/H13.butterworth.pd
new file mode 100644
index 00000000..4cdcb628
--- /dev/null
+++ b/pd/doc/3.audio.examples/H13.butterworth.pd
@@ -0,0 +1,74 @@
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+#X obj 22 67 f \$0;
+#X text 35 195 This subpatch loads initial;
+#X text 31 219 values in number boxes.;
+#X msg 22 91 \; \$1-lf 80 \; \$1-hf 150 \;;
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+#X text 553 359 gain=0;
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+#X text 593 60 5;
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+#X text 598 301 1;
+#X text 575 435 updated for Pd version 0.39;
+#X text 186 -4 BUTTERWORTH FILTER;
+#X obj 216 398 butterworth3~;
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+#X text 232 318 poles;
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+#X text 24 20 The butterworth filter can be configured for low-pass
+\, high-pass \, and shelving \, depending on the placement of the poles
+and zeros. For low-pass \, the poles are placed to set the cutoff frequency
+and the zeros are at -1 (the Nyquist). Leaving the poles fixed and
+moving the zeros then gives shelving filters. In this example \, the
+actual filtering is relegated to an abstraction (butterworth3~) which
+takes frequencies corresponding to the pole and zero placement.;
+#X text 24 147 The butterworth3~ abstraction computes filter coeffients
+using control messages \, and so it is not suitable for continuously
+time-varying Butterworth filters. For that \, it is often appropriate
+to use time-saving approximations \, but precisely which approximations
+to use will depend on the way the filter is to be used.;
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