Pd-list September 2010

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138 participants
246 discussions

Guitar distortion (Chebyshev?)
by Pierre Massat 13 Sep '10

13 Sep '10

Hi List! I have been playing a bit with SoundHack +Chebyshev external, hoping that i could get a nice distorted sound for my guitar. Leaving aside the fact that the parameters are quite difficult to use, i m faced with a few problems. One issue is that it seems to sound good only when the amplitude of the sound is close to 1, which is obviously not the case for a raw guitar sound. Anything that gets above 1 induces a very harsh burst of noise. I have tried a compressor (the one that comes with the SoundHack bundle), but doesn't seem to be able to behave as a limiter, since the compression ratio cannot go to infinity. Does anybody know of a good sounding compressot that could work as a limiter? More generally, i m not sure if i m headed in the right direction. What i want to do is something like: Guitar adc ---> compressor ---> Chebyshev distortion ---> hip~ 5 to remove DC component ---> dac to amp I m not sure whether this is the right way of dealing with guitar distortion. I m not sure Chebyshev polynomials is the right waveshaping technique either. I ve found this ( http://www.mitpressjournals.org/doi/pdf/10.1162/comj.2009.33.2.85), in which several waveshaping techniques are mentioned, I don't know if anybody has any experience with these? I m not trying to model an amp here, i m only interested in modeling a distortion unit. There is a thread in the archives, but i'd be interested in getting some fresher thoughts upon the subject... Pierre

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Re: [PD] audio settings problem
by Marco Donnarumma 13 Sep '10

13 Sep '10

Hi Stefan, a student of mine had the same problem. She used to have an M-audio ext. sound card (don't remember the model) plugged into Pd and experienced the same as you. I recall she said it was working properly some time before our workshop (i.e. in july). seems it could be a portaudio update related issue. MAC os, pd-extended 42.5 rc4. M > I tried to find the latest autobuild where I can see my audio devices, > without success > > is there an archive for the autobuild before june? > the strange thing is that i am pretty sure I use an autobuild from > july/august and it was working fine > > did someone have similar issues? > or is this bug realtive to my system.... > > > best, > st?fan > > 2010/9/12 st?fan piat <stefanpiat(a)gmail.com> > > > hello, > > > > unfortunately this doesn't resolve this problem... > > > > 2010/9/11 Hans-Christoph Steiner <hans(a)at.or.at> > > > > > >> Hey St?fan, > >> > >> I updated portaudio, could you try this build? > >> > >> > >> > http://autobuild.puredata.info/auto-build/2010-09-11/Pd-0.42.5-extended-mac… > >> > >> > >> .hc > >> > >> On Mon, 2010-09-06 at 21:00 +0200, st?fan piat wrote: > >> > I'm a facing another audio setting weirdness > >> > I am now using pd-extended-0.41.4 (osx 10.5.8) > >> > > >> > > >> > I configured the audio settings for an external sound card (m-audio > >> > fast track pro) with 4 channels out > >> > and it worked fine > >> > > >> > > >> > but now, if I don't use the sound card, when I open pd the outputs > >> > channels are set to 4 by default + no device selected, if select > >> > built-in output + 2 channels out, pd crash.... > >> > > >> > > >> > am I doing something wrong ? > >> > > >> > 2010/9/5 st?fan piat <stefanpiat(a)gmail.com> > >> > done.. > >> > > >> > > -- Marco Donnarumma aka TheSAD Independent New Media Arts Professional, Performer, Teacher - Edinburgh, UK PORTFOLIO: http://marcodonnarumma.com LAB: http://www.thesaddj.com | http://cntrl.sourceforge.net | http://www.flxer.net EVENT: http://www.liveperformersmeeting.net

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puredata.info - upload + update file?
by João Pais 13 Sep '10

13 Sep '10

Hi, I have a file stored in puredata.info that I'll be updating several times in the near future. For now the only I found to upload the same file (a new file with the same name) is to delete the old file, then create a new one with the same name. Is there a faster way of doing this? Best, JoÃ£o Pais -- Friedenstr. 58 10249 Berlin (Deutschland) Tel +49 30 42020091 | Mob +49 162 6843570 Studio +49 30 69509190 jmmmpais(a)googlemail.com | skype: jmmmpjmmmp

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Any Live Coders?
by Andrew Faraday 13 Sep '10

13 Sep '10

Hey All I've been interested in the possibility of live coding with pure data, indeed, in the guise of running Pd workshops. I've taken the live coding style, instant, step-by-step on and tend to throw Pd systems together spontaneously in my spare time. Either way, I was wondering if anyone feels like sharing some of their mental templates for a live code approach. Just to get the ball rolling, here's one of my favorites: [bpm] (right outlet) | [phasor~] | [s~ something] (a few of these, multiplying and dividing the measure frequency, sends with names like 1bar, 4bar, halfbar etc) [r~ something] | [expr~ $v1 > xx] (between 0 and 1)and[expr~ $v1 < xx] (same) and multiply the two expression outlets together with [*~] Mutiply the result of that by an audio signal, usually an oscillator. and out to a [dac~] Then multiple copies of this with different values in the expression and oscillators. Can then be edited by random or sequential variations on the pitch of the oscillators, changing the figures in the expr~ figures.I'm quite fond of the possibility of changing the receive id's thus keeping a sequence intact but doubling or halfing the speed of certain sequences within it. Also the speed can be varied (which then effects the speed of the whole patch). Also, slightly out of the way, you could use the phasor outlets directly control oscillator pitches, volumes, or filter frequencies. This template does tend to work out differently each time I use it, also.

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audio settings problem
by stéfan piat 13 Sep '10

13 Sep '10

hello, I have installed pd0.42.5-extended rc-5 on osx 10.5.8 and on my audio settings I see only input device #1, #2 (no build-in input//output) I can't succeed to hear any sounds when I change channels to 2, I have in the console the following message : unknown API and pd crash any idea ? thanks stéfan

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Re: [PD] Pd-list Digest, Vol 66, Issue 57
by Mathieu Bosi 12 Sep '10

12 Sep '10

Maybe also this could be of interest: http://puredata.hurleur.com/sujet-2453-cubic-soft-clip-distortion Mathieu 2010/9/12 <pd-list-request(a)iem.at> > Send Pd-list mailing list submissions to > pd-list(a)iem.at > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.puredata.info/listinfo/pd-list > or, via email, send a message with subject or body 'help' to > pd-list-request(a)iem.at > > You can reach the person managing the list at > pd-list-owner(a)iem.at > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Pd-list digest..." > > Today's Topics: > > 1. Re: Guitar distortion (Chebyshev?) (Mathieu Bouchard) > 2. Re: Guitar distortion (Chebyshev?) (Mathieu Bouchard) > 3. Re: puredata.info wiki structured text format? > (Hans-Christoph Steiner) > 4. Re: Guitar distortion (Chebyshev?) (Martin Peach) > 5. Re: Pd-extended 0.42.5 release candidate 6 released! > (Hans-Christoph Steiner) > 6. Re: Guitar distortion (Chebyshev?) (Mathieu Bouchard) > 7. Re: Guitar distortion (Chebyshev?) (Kim Cascone) > 8. Re: Guitar distortion (Chebyshev?) (Martin Peach) > > > ---------- Messaggio inoltrato ---------- > From: Mathieu Bouchard <matju(a)artengine.ca> > To: Pierre Massat <pimassat(a)gmail.com> > Date: Sun, 12 Sep 2010 11:07:29 -0400 (EDT) > Subject: Re: [PD] Guitar distortion (Chebyshev?) > On Sun, 12 Sep 2010, Pierre Massat wrote: > > One issue is that it seems to sound good only when the amplitude of the >> sound is close to 1, which is obviously not the case for a raw guitar sound. >> > > Tu peux utiliser la version polynômiale des formules de Tchébycheff, car > celles-ci s'étendent au delà de 1 sans problème, tandis que la version > arccosinus a des problèmes en dehors de l'intervalle -1..+1 (pour simplifier > les choses, on dit habituellement qu'elle n'existe pas en dehors de cet > intervalle...). > > Mais c'est quand même mieux de pas tellement dépasser ±1, c'est juste que > les polynômes pardonnent beaucoup plus. C'est un effet très dépendant du > volume. > > _______________________________________________________________________ > | Mathieu Bouchard ------------------------------ Villeray, Montréal, QC > > ---------- Messaggio inoltrato ---------- > From: Mathieu Bouchard <matju(a)artengine.ca> > To: Pierre Massat <pimassat(a)gmail.com> > Date: Sun, 12 Sep 2010 11:13:55 -0400 (EDT) > Subject: Re: [PD] Guitar distortion (Chebyshev?) > On Sun, 12 Sep 2010, Pierre Massat wrote: > > I m not trying to model an amp here, i m only interested in modeling a >> distortion unit. >> > > Ah, I forgot, did you try [expr~ tanh($v1)] ? > > At first I assumed that you wanted to go beyond that simple distorsion and > into more interesting forms of distortion. Chebyshev's are only useful if > you want something that can also sounds like pitch shifts by harmonic steps. > > I think that tanh is rather close to the physical behaviour of capacitors > being strained, but surely not exactly that, and I didn't do the math to > figure out what the real formula would be. (Did anyone try that ?) > > _______________________________________________________________________ > | Mathieu Bouchard ------------------------------ Villeray, Montréal, QC > > ---------- Messaggio inoltrato ---------- > From: Hans-Christoph Steiner <hans(a)at.or.at> > To: "João Pais" <jmmmpais(a)googlemail.com> > Date: Sun, 12 Sep 2010 11:29:51 -0400 > Subject: Re: [PD] puredata.info wiki structured text format? > > On Sep 12, 2010, at 4:14 AM, João Pais wrote: > > I personally loathe the stucturedText format. I find it very difficult >>> to make it work. I use the MoinMoin syntax whenever I create a page on >>> puredata.info. >>> >> >> is there a reference link for that as well? >> >> I didn't said, but I'm asking this because I wanted to put in an excel >> chart. usually I use normal html. >> > > > http://wiki.winehq.org/SyntaxReference > > .hc > > > > ---------------------------------------------------------------------------- > > Terrorism is not an enemy. It cannot be defeated. It's a tactic. It's > about as sensible to say we declare war on night attacks and expect we're > going to win that war. We're not going to win the war on terrorism. > - retired U.S. Army general, William Odom > > > > > > > ---------- Messaggio inoltrato ---------- > From: Martin Peach <martin.peach(a)sympatico.ca> > To: Mathieu Bouchard <matju(a)artengine.ca> > Date: Sun, 12 Sep 2010 11:32:41 -0400 > Subject: Re: [PD] Guitar distortion (Chebyshev?) > On 2010-09-12 11:13, Mathieu Bouchard wrote: > >> On Sun, 12 Sep 2010, Pierre Massat wrote: >> >> I m not trying to model an amp here, i m only interested in modeling a >>> distortion unit. >>> >> >> Ah, I forgot, did you try [expr~ tanh($v1)] ? >> >> At first I assumed that you wanted to go beyond that simple distorsion >> and into more interesting forms of distortion. Chebyshev's are only >> useful if you want something that can also sounds like pitch shifts by >> harmonic steps. >> >> I think that tanh is rather close to the physical behaviour of >> capacitors being strained, but surely not exactly that, and I didn't do >> the math to figure out what the real formula would be. (Did anyone try >> that ?) >> >> > See attached patch. I use it instead of a fuzz box now. > It's not the capacitors, it's the amplifier losing gain when it approaches > the power supply. Vacuum tubes have a softer knee than transistors. > > > Martin > > > ---------- Messaggio inoltrato ---------- > From: Hans-Christoph Steiner <hans(a)at.or.at> > To: "João Pais" <jmmmpais(a)googlemail.com> > Date: Sun, 12 Sep 2010 12:03:25 -0400 > Subject: Re: [PD] Pd-extended 0.42.5 release candidate 6 released! > > On Sep 12, 2010, at 4:14 AM, João Pais wrote: > > a couple of my abstractions aren't packaged with this distribution, e.g. >>>> bezier.pd (it's in >>>> >>>> https://pure-data.svn.sourceforge.net/svnroot/pure-data/trunk/abstractions/… >>>> ). >>>> >>> >>> Yes, once the release process has started, then Pd-extended is built out >>> of a branch in SVN and not trunk. You can either check in the changes >>> yourself, or tell me what to check in. >>> >> >> you mean there are 2 places where we should submit the code? is there a >> wiki page with the instructions for it? >> > > When making a release, we work out of a branch so that only expected > changes get incorporated into the release. > > I would prefer to do it myself, then I don't have to ask you again next >> time about it :) >> >> João >> > > The current Pd-extended release branch is here: > > svn co > https://pure-data.svn.sourceforge.net/svnroot/pure-data/branches/pd-extende… > > There are some basic instructions here, basically you want to do an SVN > merge from trunk into a branch: > > http://puredata.info/docs/developer/GettingIntoPdextended > > some instructions: > > http://www.google.com/webhp?hl=en#sclient=psy&hl=en&site=webhp&q=svn+merge+… > > .hc > > > ---------------------------------------------------------------------------- > > Programs should be written for people to read, and only incidentally for > machines to execute. > - from Structure and Interpretation of Computer Programs > > > > > > ---------- Messaggio inoltrato ---------- > From: Mathieu Bouchard <matju(a)artengine.ca> > To: Martin Peach <martin.peach(a)sympatico.ca> > Date: Sun, 12 Sep 2010 12:05:30 -0400 (EDT) > Subject: Re: [PD] Guitar distortion (Chebyshev?) > On Sun, 12 Sep 2010, Martin Peach wrote: > > It's not the capacitors, it's the amplifier losing gain when it approaches >> the power supply. >> > > Yeah, but it seems to be a pattern similar to the one found in capacitors, > because capacitor theory has exp(-x) all over it, and the only way that > capacitors behave like [hip~] is when the signal is much below the capacity > rating (µF)... otherwise they lose gain... when they don't, it's because > exp(-x) can be well approximated by x. > > And then, exp is very close to tanh in several different ways, one of them > being this (use gnuplot) : > > plot [-2:2] [-1:1] exp(x*sqrt(2))-1, 1-exp(-x*sqrt(2)), tanh(x), x > > I put the plain 'x' at the end to show what I mean above (though you > already know that) > > _______________________________________________________________________ > | Mathieu Bouchard ------------------------------ Villeray, Montréal, QC > > ---------- Messaggio inoltrato ---------- > From: Kim Cascone <kim(a)anechoicmedia.com> > To: pd-list(a)iem.at > Date: Sun, 12 Sep 2010 10:22:59 -0700 > Subject: Re: [PD] Guitar distortion (Chebyshev?) > couldn't locate the Smeck.pd download on the link posted for Miller's page > but here is the direct link in case you couldn't find it: > http://crca.ucsd.edu/~msp/smeck/latest/smeck-01.zip<http://crca.ucsd.edu/%7Emsp/smeck/latest/smeck-01.zip> > > > > > ---------- Messaggio inoltrato ---------- > From: Martin Peach <martin.peach(a)sympatico.ca> > To: Mathieu Bouchard <matju(a)artengine.ca> > Date: Sun, 12 Sep 2010 13:24:57 -0400 > Subject: Re: [PD] Guitar distortion (Chebyshev?) > On 2010-09-12 12:05, Mathieu Bouchard wrote: > >> On Sun, 12 Sep 2010, Martin Peach wrote: >> >> It's not the capacitors, it's the amplifier losing gain when it >>> approaches the power supply. >>> >> >> Yeah, but it seems to be a pattern similar to the one found in >> capacitors, because capacitor theory has exp(-x) all over it, and the >> only way that capacitors behave like [hip~] is when the signal is much >> below the capacity rating (µF)... otherwise they lose gain... when they >> don't, it's because exp(-x) can be well approximated by x. >> >> > I guess it's similar since capacitors charge at a rate proportional to a > voltage difference, while transistors can supply charge carriers at a rate > proportional to a voltage difference, so caps charge fastest when they are > nearly empty and transistors have the best gain with small signal inputs. > > The whole universe has exp written all over it in fact... > > And then, exp is very close to tanh in several different ways, one of >> them being this (use gnuplot) : >> >> plot [-2:2] [-1:1] exp(x*sqrt(2))-1, 1-exp(-x*sqrt(2)), tanh(x), x >> >> I put the plain 'x' at the end to show what I mean above (though you >> already know that) >> >> > Of course, all the hyperbolic trig functions are made from exp, by > definition. > > http://en.wikipedia.org/wiki/Hyperbolic_function > > Another use of exp is the sigmoid function used in biology, that can be > used to make a soft transition from one state to another as in 'fuzzy > logic'. > > Martin > > _______________________________________________ > Pd-list mailing list > Pd-list(a)iem.at > to manage your subscription (including un-subscription) see > http://lists.puredata.info/listinfo/pd-list > >

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puredata.info wiki structured text format?
by João Pais 12 Sep '10

12 Sep '10

Hi, is there any place where it shows what are the tricks to use structured text in the pd wiki? I couldn't find any help window. For example, many wikis nowadays offer pre-formated options. Is it possible in this one as well? JoÃ£o Pais -- Friedenstr. 58 10249 Berlin (Deutschland) Tel +49 30 42020091 | Mob +49 162 6843570 Studio +49 30 69509190 jmmmpais(a)googlemail.com | skype: jmmmpjmmmp

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netsend (UDP): cannot connect to 255.255.255.255
by Matteo Sisti Sette 12 Sep '10

12 Sep '10

Hi, In Windows, I've always used "connect 255.255.255.255 (someport)" with a [netsend 1] to broadcast packets to the whole local network to a given port. Any [netreceive (someport) 1] on the same network and/or the same machine could receive all packets sent with the netsend above. However, I am trying this in Linux (ubuntu) now and it doesn't work. The [netsend 1] object won't even connect (the outlet doesn't output a 1) but it won't complain either: it says "connecting to port 5555" but doesn't print any error message when failing to connect. It does print error messages ("netsend: not connected") when trying to send messages. I know I can use the specific address of the network, e.g. 192.168.1.255, but this won't work if I use the patch on a network with a different address other than 192.168.1.XXX Why doesn't 255.255.255.255 work and is there a workaround? thanks m.

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prime numbers
by Kim Cascone 12 Sep '10

12 Sep '10

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Re: [PD] Introduction to elementary filter components in Pd
by Ingo Scherzinger 12 Sep '10

12 Sep '10

Hi Mathieu, that's a cool simple filter. I've been looking for a [hip~] that works at sampling rate. Would you mind posting the formula for a [hip~] that works the same way (if it's not too much trouble for you)? Thank you, Ingo >>If you don't mind, could you pass a patch along? > >ok. I made one, and I used [expr~] instead, so that it's fully signal-rate. >_______________________________________________________ >| Mathieu Bouchard ------------------------------ Villeray, Montr?al, QC >

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Pd-list September 2010