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/usr/lib/pd/extra/rtc/schweller-help.pd is in pd-rtclib 4.1-2.

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#N canvas 308 99 592 520 10;
#X text 29 36 schweller;
#X msg 350 18 Envelopes;
#X text 29 478 vs. 3: new inlet added (fraction factor);
#X floatatom 369 263 4 0 0 2 fraction_factor - -;
#X obj 53 203 tgl 15 0 empty empty start/stop 0 -6 0 8 -262144 -1 -1
1 1;
#X text 29 464 1993-96 by Karlheinz Essl;
#X floatatom 314 243 4 0 0 2 duration - -;
#X floatatom 256 223 4 0 0 2 middle_velocity - -;
#X floatatom 190 203 4 0 0 2 start/end_velocity - -;
#X msg 45 345 60;
#X floatatom 83 351 0 0 0 1 velocity - -;
#X msg 75 203 0;
#X text 168 50 vs. 3;
#X obj 53 266 t b b;
#X text 29 68 Generates a transition between a start velocity \, a
middle velocity and an end velocity (which the same as start velocity).
By this you can create crescendo-decrescendo resp. decrescendo-crescendo
envelopes ("hairpins" - in german: "Schweller"). A fraction factor
(float between 0 and 1) send in the rightmost inlet determines the
proportion between crescendo and decrescendo part.;
#X obj 45 398 play2 127 90 0 1;
#X obj 53 239 metro 100;
#X obj 83 316 schweller 15 127 3000 0.25;
#X connect 3 0 17 4;
#X connect 4 0 16 0;
#X connect 6 0 17 3;
#X connect 7 0 17 2;
#X connect 8 0 17 1;
#X connect 9 0 15 0;
#X connect 10 0 15 1;
#X connect 11 0 4 0;
#X connect 13 0 9 0;
#X connect 13 1 17 0;
#X connect 16 0 13 0;
#X connect 17 0 10 0;
#X connect 17 1 11 0;