Never used line before...

Reply to Never used line before... on Tue, 28 Jul 2009 22:14:35 GMT

adam.notebook — Tue, 28 Jul 2009 22:14:35 GMT

I just recently connected a Lexicon multi-effects processor to Pd via midi and have been controlling the settings with a patch. It's pretty cool to control the pitch-shifter and delay times randomly.

I've never used [line] for anything before, but here's what I'm thinking... I want to set it up so that I have two sliders each ranging from 0 to 127. For example, I can set the first to a value of 45 and the second to a value of 82. I already know how to have a metro selecting back and forth between these two values, but can I use [line] to smoothly go back and forth between them? Instead of just jumping back and forth from 45 to 82, can I have controls for speed and "smoothness" of the ramp. This would make for a really cool pitch vibrato with depth controls and sort of like a shape control.

I already sort of accomplished this by reading through an array and drawing the points to make a smooth waveshape, but this other way seems more straightforward if it functions the way I think it does.

I know I can experiment once I get home from work, but my mind tends to be more creative while I am stuck here being paid to not be creative.

Reply to Never used line before... on Wed, 29 Jul 2009 03:46:26 GMT

Maelstorm — Wed, 29 Jul 2009 03:46:26 GMT

[line] accepts a message with the destination number and how many ms it takes to get there. You can, of course, [pack] those to control them seperately.

[45( [82(
| /
| /
| / [0\ <-- ms
|/ |
[pack f f]
|
[line]

If you want them to be something other than a straight line, though, you might want to have a [line] look up a curve in an array and scale the output. I think the mapping library is useful for this kind of stuff, but I've never used it myself.

Reply to Never used line before... on Wed, 29 Jul 2009 17:35:00 GMT

adam.notebook — Wed, 29 Jul 2009 17:35:00 GMT

Once again, thank you. Works exactly like I hoped.

Reply to Never used line before... on Thu, 30 Jul 2009 11:59:33 GMT

adam.notebook — Thu, 30 Jul 2009 11:59:33 GMT

So then what exactly do you use [line~] for? Obviously it is for audio, but what is an example of using it? From what I have read, it is used to smooth out audio clicks... I think. That makes sense to me now that I have seen how to use it to go smoothly between different numbers. Does it do essentially the same thing when you use it for an audio signal? And if so, what sort of number messages do you send to it to acheive the best results? Thanks.

Reply to Never used line before... on Thu, 30 Jul 2009 15:15:21 GMT

toxonic — Thu, 30 Jul 2009 15:15:21 GMT

line~ and vline~ process the ramps in higher precision then the line object, that that sends out it's control messages every 20 ms.
check out help browser -> audio examples -> "C03. zipper.noise.pd" and "C04.control.to.signal.pd" - this should help you understand the objects.
also you could have a look at the chapters A03. and A04. in audio examples.