/usr/share/puredata/doc/3.audio.examples/J05.triangle.pd is in puredata-doc 0.47.1-3.
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#X text 350 505 updated for Pd version 0.39;
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#X text 126 50 SLOPES (percent);
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#X text 30 4 Making waveforms with corners by specifying line segment
slopes;
#X text 136 67 up;
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#X text 29 317 Occasionally a second method for making corners is more
convenient. Here we specify the slopes of the rising and falling segments
(as always \, in units per cycle). We then make a triangle wave with
a corner at (0 \, 0) and another one \, placed somewhere within the
cycle. The slopes of the two lines determine the second point \, which
will have an x value of t/(s+t) (if we let s denote the rising slope
and t the falling one \, both as positive numbers). The y value is
st/(s+t). If we wish instead to specify the corner location (x \, y)
(with x in cycles \, 0<x<1) we set s = y/x and t = y/(1-x). The DC
value is y/2.;
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