/usr/lib/pd/extra/cyclone/trapezoid~-help.pd is in pd-cyclone 0.2~beta1-2.
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#X text 0 33 LICENSE SIBSD;
#X text 0 153 LIBRARY cyclone;
#X text 0 133 OUTLET_0 signal;
#X text 0 0 KEYWORDS signal trapezoid wavetable lo hi lo/hi phase ramp
wave;
#X text 0 53 DESCRIPTION a trapezoid wavetable;
#X text 0 73 INLET_0 signal message;
#X text 0 93 INLET_1 signal float;
#X text 0 113 INLET_2 signal float;
#X text 0 175 VERSION 0.2-beta1;
#X text 0 193 AUTHOR Krzysztof Czaja;
#X text 1 211 RELEASE_DATE 2002;
#X text 2 230 WEBSITE http://suita.chopin.edu.pl/~czaja/miXed/externs/cyclone.html
;
#X text 2 262 HELP_PATCH_AUTHORS Christoph Kummerer. Revised by Jonathan
Wilkes for Pd-extended 0.42 to conform to the PDDP template. Alex Cleveland
updated this patch for Pd-l2ork version 2013.05.28. Fred Jan Kraan
adapted the patch to pd-extended 2015-02-02;
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#X text 6 1 Related Objects;
#X restore 205 811 pd Related_objects;
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#X obj 478 11 trapezoid~;
#X text 12 23 a trapezoidal wavetable;
#X text 106 554 signal;
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#X text 106 607 signal;
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#X text 106 654 signal;
#X text 106 628 float;
#X text 106 675 float;
#X text 179 554 - input signal;
#X text 106 712 signal;
#X text 179 712 - the trapezoidal wavetable output;
#X floatatom 171 173 0 0 0 0 - - -;
#X msg 171 194 hi \$1;
#X floatatom 214 173 0 0 0 0 - - -;
#X msg 214 194 lo \$1;
#X floatatom 161 118 0 0 0 0 - - -;
#X text 40 48 trapezoid~ is a trapezoidal wavetable with signal inputs
to change ramp up/down phase position. The default lo/hi points are
0 and 1 \, but may be changed using the lo/hi messages.;
#X obj 331 228 sig~ 0.9;
#X obj 268 203 sig~ 0.1;
#X text 88 755 1) float;
#X text 179 755 - initial ramp up;
#X text 88 775 2) float;
#X text 179 775 - initial ramp down;
#X text 106 577 message;
#X text 179 577 - lo/hi messages change the lo/hi points (default 0/1)
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#X text 169 155 change the lo/hi points;
#X text 233 139 input signal;
#X obj 161 275 cyclone/trapezoid~ 0.1 0.9;
#X obj 162 355 tabwrite~ \$0-trapezoid;
#X obj 161 139 phasor~ 200;
#X obj 368 389 output~;
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#X text 111 246 level;
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#X text 179 607 - change ramp up phase start position \, effectively
changing its steepness;
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#X text 398 217 down ramp;
#X text 400 167 up ramp;
#X text 179 654 - change ramp down phase start position \, effectively
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