I found and fixed a condition that kept some sustain changes from being
propagated. I cleaned other stuff up a little, too.
(tweaked text from previous announcement:)
> I have been working on envelopes lately, and I have come up with
> something that I'd like to share. I started out with the basic ADSR in
> Miller's examples; I wanted variable envelope curves, but I didn't want
> the overhead of on-the-fly sqrt's or complex expr's. Therefore,
> [multiCurveAdsr] uses table-lookup for enveloping, with just one
> multiplication for level-scaling. The lookup table only needs to be
> computed when the "curve factor" is changed.
>
> Three basic curve types are possible. C (curve factor) = 1 gives the
> basic linear envelope. C > 1 gives a continuous range of fatter,
> "ead"-like envelopes. C < 1 is a special case; for any value of C less
> than 1, you get one "quartic"-like, hollow curve. (I really like the
> way this one sounds, by the way).
>
> The math in the [pd makeCurve] subpatch is not elegant -- I took an
> empirical approach, tweaking things until I got the shapes I wanted --
> but it works well enough. One little hitch I ran into was that sustain
> level varied with different curve factors, so I made a corrective
> subpatch that keeps sustain values consistent across the different
> curves. This subpatch only comes into play when the sustain value or
> curve factor changes.
>
> The right output emits 1 on attack, and 0 after release is complete. I
> use this to switch~ the voice being enveloped, for further CPU-cycle
> economy.
>
> The help patch shows the effect of the different curve factors
> graphically. I don't think there are any dependencies outside of
> "Miller Vanilla" PD.
>
> I use [multiCurveAdsr] for my own synthesis abstractions, and find that
> it sounds pretty good, plus it's thrifty on CPU-usage, even with many
> voices. I hope somebody else finds it useful. Any suggestions for
> improvement will be greatly appreciated.
Phil Stone
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#X text 13 63 trigger;
#X obj 17 132 sel 0;
#X obj 221 316 del \$2;
#X obj 240 342 f \$4;
#X msg 17 192 stop;
#X text 75 304 ATTACK;
#X obj 240 525 outlet~;
#X text 54 74 if zero;
#X text 55 91 release;
#X text 44 109 bang if attack;
#X text 320 2 When you send this patch a nonzero trigger it schedules
a line~ to do an attack and decay \, and if zero \, it starts the release
ramp.;
#X obj 240 413 vline~;
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#X obj 240 497 *~;
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#X array \$0-envCurve 102 float 0;
#X coords 0 1 101 0 100 100 1;
#X restore 500 272 graph;
#X text 604 364 0;
#X text 603 264 1;
#X text 192 341 DECAY;
#X text 347 275 RELEASE;
#X obj 141 130 f;
#X obj 422 454 outlet switch;
#X obj 389 322 pack 0 \$5;
#X obj 240 447 tabread4~ \$0-envCurve;
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#X obj 133 182 s \$0-activate;
#X msg 105 156 1;
#X obj 66 132 t b b b;
#X obj 362 296 t b b;
#X obj 363 357 del \$5;
#X msg 363 382 0;
#X text 385 506 - when finished (i.e. \, end of release) \,;
#X text 386 490 - on attack: send "on" for dsp of parent voice;
#X text 395 520 send "off" for dsp of parent voice;
#X text 384 475 This outlet may be used as follows:;
#X obj 156 107 inlet attackLevel;
#X obj 492 189 change;
#X obj 502 136 loadbang;
#X obj 67 325 pack 100 \$2;
#X text 17 1 Multi-curve ADSR;
#X obj 255 474 r \$0-levelmult;
#X obj 141 153 s \$0-levelmult;
#X text 452 36 Curve Factors;
#X text 17 19 arguments: level \, attack time \, decay time \, sustain
level (proportion of overall level 0 - 100) \, release time;
#X obj 492 107 inlet curveFactor;
#X text 388 83 > 1 - exponential (fat) curves \, varying with C;
#X msg 502 159 1;
#X text 118 58 This adsr uses table-lookup for envelope curves \,;
#X text 119 73 so it should be pretty cpu-efficient.;
#X text 399 68 1 - linear;
#X obj 17 162 t b b;
#X text 36 409 and left-over release switch~;
#X text 48 195 (*);
#X text 35 394 (*) cancel decay \,;
#X text 388 53 < 1 - "quartic-like" (hollow) curve \, C=-0.214;
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#X obj 142 120 f;
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#X obj 71 224 f;
#X obj 318 313 expr 1 - (pow( ($f1 / 102) \, $f2) );
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#X obj 71 314 expr pow( ($f1 / 102) \, $f2) -1;
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#X msg 285 133 -0.214;
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#X obj 20 176 moses 2;
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#X connect 17 0 7 0;
#X connect 19 0 5 0;
#X connect 20 0 18 0;
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#X connect 23 0 25 1;
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#X connect 25 0 24 0;
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#X connect 34 1 8 0;
#X connect 36 0 0 0;
#X connect 36 1 19 0;
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#X obj 252 294 + 1;
#X obj 159 355 tabread \$0-envCurve;
#X obj 28 7 inlet sustain;
#X obj 72 498 outlet correctedSustain;
#X obj 188 440 f;
#X obj 143 7 inlet curve;
#X obj 159 256 t f f;
#X obj 204 270 b;
#X obj 159 293 / 100;
#X obj 159 410 sel 0;
#X obj 159 232 spigot;
#X msg 160 188 0;
#X msg 192 188 1;
#X obj 315 233 spigot;
#X msg 316 189 0;
#X msg 348 189 1;
#X obj 361 295 f;
#X obj 316 356 tabread \$0-envCurve;
#X obj 345 441 f;
#X obj 316 257 t f f;
#X obj 361 271 b;
#X obj 316 294 / 100;
#X obj 410 274 - 1;
#X obj 159 384 <=;
#X obj 316 411 sel 1;
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#X obj 204 319 t f f f;
#X obj 53 114 sel 0;
#X msg 60 228 0;
#X obj 237 142 moses 1;
#X obj 316 385 <=;
#X obj 62 138 moses 100;
#X msg 84 249 100;
#X obj 152 113 sel 1;
#X obj 23 204 f;
#X obj 152 137 t b b b;
#X text 237 19 Finds the input sustain value in the envelope;
#X obj 28 55 f;
#X obj 143 54 t b f;
#X obj 28 31 change;
#X obj 143 30 change;
#X obj 155 77 f;
#X obj 28 83 t f f b;
#X text 238 36 curve table \, and outputs the index of it.;
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#X connect 7 0 0 0;
#X connect 7 1 9 0;
#X connect 8 0 0 0;
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#X connect 10 1 8 0;
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#X connect 12 0 11 1;
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#X connect 34 0 36 0;
#X connect 34 1 30 0;
#X connect 35 0 4 0;
#X connect 36 0 35 0;
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#X connect 36 2 15 0;
#X connect 38 0 43 0;
#X connect 39 0 38 0;
#X connect 39 1 42 1;
#X connect 40 0 38 0;
#X connect 41 0 39 0;
#X connect 42 0 34 0;
#X connect 43 0 35 1;
#X connect 43 1 28 0;
#X connect 43 2 42 0;
#X restore 334 146 pd correctSustain;
#X connect 0 0 2 0;
#X connect 2 0 54 0;
#X connect 2 1 31 0;
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#X connect 4 0 13 0;
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#X connect 40 0 59 0;
#X connect 41 0 50 0;
#X connect 42 0 12 0;
#X connect 44 0 14 1;
#X connect 48 0 40 0;
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#X connect 50 0 40 0;
#X connect 54 0 32 0;
#X connect 54 1 5 0;
#X connect 60 0 4 1;
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#X array envelope 10000 float 2;
#X coords 0 1 10000 0 400 140 1;
#X restore 22 180 graph;
#X obj 304 -173 loadbang;
#X obj 138 -30 nbx 5 14 0 100 0 1 empty empty Level 0 -8 0 10 -262144
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#X obj 262 89 nbx 5 14 0 100 0 1 empty empty R 0 -8 0 10 -262144 -1
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#X msg 304 -147 \; pd dsp 1;
#X obj 41 -177 bng 15 250 50 0 empty empty empty 0 -6 0 10 -262144
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#X msg 80 -41 0;
#X obj 80 -65 delay 200;
#X obj 131 -88 nbx 5 14 -1e+37 1e+37 0 1 empty empty hold_time 0 -6
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#X msg 41 -41 1;
#X obj 96 153 tabwrite~ envelope;
#X obj 311 122 nbx 5 14 0 20 0 1 empty empty curve_factor 0 -6 0 10
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#X obj 106 -185 notein;
#X obj 106 -162 sel 0;
#X obj 41 -159 t b b;
#X obj 41 -4 t f b;
#X obj 133 -139 t b f;
#X obj 212 -97 / 127;
#X obj 12 -201 loadbang;
#X text 91 -208 Hit bang or MIDI key to see current envelope;
#X text 293 -79 Curve Factors;
#X text 240 -47 1 - linear;
#X text 229 -32 > 1 - exponential (fat) curves \, varying with C;
#X obj 110 124 multiCurveAdsr 0.98 10 20 99 20;
#X floatatom 316 159 5 0 0 0 - - -;
#X text 350 155 for switch~ing parent;
#X text 229 -62 < 1 - "quartic-like" (hollow) curve \, C=-0.214;
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#X connect 3 0 26 2;
#X connect 4 0 26 3;
#X connect 5 0 26 4;
#X connect 6 0 26 5;
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#X connect 9 0 26 0;
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#X connect 15 1 16 0;
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#X connect 17 0 12 0;
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#X connect 18 0 26 0;
#X connect 18 1 13 0;
#X connect 19 0 12 0;
#X connect 19 1 20 0;
#X connect 20 0 2 0;
#X connect 21 0 17 0;
#X connect 26 0 13 0;
#X connect 26 1 27 0;
