Smooth Delay Time Changes?

If you are trying to do variable delay line stuff, you might
want to look into Emmanuel Jourdan's "ejies" externals.
It has a great variable delay line external.
http://www.e--j.com/sphpblog/

Anthony

----- Original Message -----
From: Steven Miller
Date: Monday, December 17, 2007 1:39 pm
Subject: Re: [maxmsp] Smooth Delay Time Changes?

> Just an FYI - generally for questions like this, posting the patch
> is
> pretty much required if you want anything other than speculation
> back
> in response.
>
> On Dec 17, 2007, at 10:41 AM, gener wrote:
>
> >
> > Hi all, I'm writing cause I'm kinda stumped on something. I'm
> > trying to make an analog delay pedal emulator in MSP. Everything
> is
> > pretty much finished except two things:
> >
> > 1 - When I move the delay "knob" in MSP...say from 500 ms to 100
> > ms, I can't get the output to smoothly emit a "delay time" change
>
> > of the signal from 500 to 100. Right now the patch basically just
>
> > skips and pops a bit until it reaches 100 ms. Hard to describe,
> but
> > I'd love it to sorta sound like a spacy time change effect that's
>
> > portamento-y until it settles at the new delay time setting.
>
> Which delay object are you using? If you are using [tapin~] and
> [tapout~], are you using a signal to specify the delay time? Using
> a
> signal will help make smooth changes in delay time while a float
> will
> 'skip' etc. I also use a 'smoother' patch to help with this.
>
> >
> > 2 - When I get the feedback delay to "self-oscillate," it gets
> out
> > of control unlike the analog version. I put in a limiter (from
> the
> > OMX tutorial) that works great in limiting the feedback loop, but
> I
> > have to manually move the threshold down everytime the patch is
> > loaded, and I'm having trouble getting the patch to just open at,
>
> > say, -12 dB as the threshold.
>
> Are you scaling the feedback amount? In order to avoid problems,
> it's
> best to scale the feedback signal to no more than about 0.9 or so.
>
> Another 'analog' characteristic would be to low-pass filter the
> feedback signal so the repeats are less bright than the direct signal.
>
> Here's a quick and easy example of all of the above you can mess
> around with for your own fun & delight. ;)
>
> #P window setfont "Sans Serif" 9.;
> #P window linecount 1;
> #P hidden newex 553 73 88 196617 unpack 1. 1. 1. 1.;
> #P hidden newex 553 50 161 196617 loadmess 0.85 440. 1000. 100.;
> #P window setfont "Sans Serif" 10.;
> #P window linecount 2;
> #P user com 245 62 82 196618 12;
> #K set 0 18021 25956 25185 25451 8275 25441 27753 28263 8257 28015
> 30062 29696;
> #K end;
> #P window linecount 1;
> #P user com 393 63 100 196618 5;
> #K set 0 17509 27745 31008 21609 28005;
> #K end;
> #P user com 663 174 100 196618 7;
> #K set 0 21357 28527 29800 26990 26400 21609 28005;
> #K end;
> #P window setfont "Sans Serif" 9.;
> #P newex 230 203 93 196617 onepole~ 2500. Hz;
> #P flonum 663 206 71 9 0. 1000. 3 3 0 0 0 221 221 221 222 222 222 0
> 0 0;
> #N vpatcher 20 74 620 474;
> #P window setfont "Sans Serif" 9.;
> #P newex 110 59 55 196617 unpack s f;
> #P newex 27 57 54 196617 unpack f f;
> #N comlet (bang) smooth time finished;
> #P outlet 61 142 15 0;
> #N comlet (signal) data smoothed over N ms.;
> #P outlet 27 142 15 0;
> #P newex 110 37 108 196617 patcherargs name 10.;
> #N comlet (int or float) smooth time (ms);
> #P inlet 89 37 15 0;
> #P newex 46 97 35 196617 f 10;
> #P newex 27 77 29 196617 t f b;
> #N comlet (int , float , or list) control data , smooth time (ms);
> #P inlet 27 37 15 0;
> #P newex 27 121 44 196617 line~ 0.;
> #P connect 1 0 8 0;
> #P connect 8 0 2 0;
> #P connect 2 0 0 0;
> #P connect 0 0 6 0;
> #P connect 2 1 3 0;
> #P fasten 3 0 0 1 51 117 66 117;
> #P connect 0 1 7 0;
> #P fasten 9 1 3 1 160 89 76 89;
> #P fasten 8 1 3 1 76 81 76 81;
> #P fasten 4 0 3 1 94 81 76 81;
> #P connect 5 0 9 0;
> #P pop;
> #P newobj 557 241 111 196617 p control-smooth 100.;
> #P flonum 557 206 71 9 0. 1000. 3 3 0 0 0 221 221 221 222 222 222 0
> 0 0;
> #P flonum 394 93 35 9 20. 4000. 3 3 0 0 0 221 221 221 222 222 222 0
> 0 0;
> #P user meter~ 422 521 502 534 50 0 168 0 103 103 103 255 153 0 255
> 0
> 0 217 217 0 153 186 0 12 3 3 3 3;
> #P user meter~ 422 369 502 382 50 0 168 0 103 103 103 255 153 0 255
> 0
> 0 217 217 0 153 186 0 12 3 3 3 3;
> #P user meter~ 422 292 502 305 50 0 168 0 103 103 103 255 153 0 255
> 0
> 0 217 217 0 153 186 0 12 3 3 3 3;
> #P flonum 247 93 47 9 0. 0.99 3 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #N vpatcher 20 74 620 474;
> #P window setfont "Sans Serif" 9.;
> #P newex 110 59 55 196617 unpack s f;
> #P newex 27 57 54 196617 unpack f f;
> #N comlet (bang) smooth time finished;
> #P outlet 61 142 15 0;
> #N comlet (signal) data smoothed over N ms.;
> #P outlet 27 142 15 0;
> #P newex 110 37 108 196617 patcherargs name 10.;
> #N comlet (int or float) smooth time (ms);
> #P inlet 89 37 15 0;
> #P newex 46 97 35 196617 f 10;
> #P newex 27 77 29 196617 t f b;
> #N comlet (int , float , or list) control data , smooth time (ms);
> #P inlet 27 37 15 0;
> #P newex 27 121 44 196617 line~ 0.;
> #P connect 1 0 8 0;
> #P connect 8 0 2 0;
> #P connect 2 0 0 0;
> #P connect 0 0 6 0;
> #P connect 2 1 3 0;
> #P fasten 3 0 0 1 51 117 66 117;
> #P connect 0 1 7 0;
> #P fasten 4 0 3 1 94 81 76 81;
> #P fasten 8 1 3 1 76 81 76 81;
> #P fasten 9 1 3 1 160 89 76 89;
> #P connect 5 0 9 0;
> #P pop;
> #P newobj 247 132 105 196617 p control-smooth 10.;
> #P newex 230 167 27 196617 *~;
> #P user ezdac~ 394 553 438 586 0;
> #P user gain~ 394 389 24 100 158 0 1.071519 7.94321 10.;
> #P newex 394 345 71 196617 tapout~ 1000;
> #P newex 394 315 65 196617 tapin~ 1000;
> #P user gain~ 394 158 24 100 158 0 1.071519 7.94321 10.;
> #P newex 394 112 49 196617 tri~ 440;
> #P window setfont "Sans Serif" 10.;
> #P user com 556 175 100 196618 5;
> #K set 0 17509 27745 31008 21609 28005;
> #K end;
> #P hidden connect 22 3 16 0;
> #P connect 16 0 15 1;
> #P connect 14 0 15 0;
> #P hidden connect 22 2 14 0;
> #P hidden connect 21 0 22 0;
> #P connect 5 0 6 0;
> #P connect 5 0 12 0;
> #P connect 5 0 6 1;
> #P fasten 4 0 7 0 399 369 215 369 215 159 235 159;
> #P connect 4 0 5 0;
> #P connect 4 0 11 0;
> #P connect 2 0 3 0;
> #P connect 2 0 10 0;
> #P connect 3 0 4 0;
> #P fasten 15 0 4 0 562 336 399 336;
> #P fasten 17 0 3 0 235 301 399 301;
> #P connect 1 0 2 0;
> #P connect 13 0 1 0;
> #P hidden connect 22 1 13 0;
> #P connect 8 0 7 1;
> #P connect 9 0 8 0;
> #P hidden connect 22 0 9 0;
> #P connect 7 0 17 0;
> #P window clipboard copycount 23;
>
> ----
> Steven M. Miller
> Professor, Contemporary Music Program
> College of Santa Fe
>
> Home
> SFIFEM
> Atrium Sound Space
> OVOS
> CMP
>
>
>