/usr/lib/puredata/doc/3.audio.examples/J02.trapezoids.pd is in puredata-doc 0.43.0-4.
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#X text 420 293 ---- 0.02 seconds ----;
#X text 427 550 updated for Pd version 0.39;
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#X text 138 30 -- PHASES (percent) --;
#X text 164 180 AMPLITUDES (percent);
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#X text 31 3 Making trapezoidal waves from sawtooth waves;
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#X text 4 476 If the amplitudes sum to zero (with negative ones to
balance positive ones) \, the slope of each linear segment becomes
zero. Otherrwise \, the segments have just enough slope to make up
for the three jumps ane get to the same starting value after each cycle..
;
#X text 4 408 Here we combine three sawtooth waves with controllable
relative phases and amplitudes (in percent \, between -100 and 100.)
Each sawtooth wave gives rise to one jump (upward or downward) per
cycle.;
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