Pd-list September 2012

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117 participants
151 discussions

getting Pd to run on Raspberry Pi
by Miller Puckette 08 Sep '12

08 Sep '12

To Pd list, I got my Pi in the mail today (only 2 or 3 weeks after ordering it I think - they're starting to catch up with the enormous demand!) and can report what I found works and what not. I loaded the Raspian distro (the one everyone suggests) and following the blog on : http://log.liminastudio.com/programming/running-puredata-on-the-raspberry-pi just typed pi@raspberrypi ~ $ sudo bash root@raspberrypi:/home/pi# apt-get update root@raspberrypi:/home/pi# apt-get install puredata and then pd ... sort of... runs right away. I had to fool with some glitches though: 1. Pd is version 0.43-2 which doesn't yet know to try to promote itself to real-time if it's not root. (This is only fixed in 0.44 which might not make it to Raspian for quite some time.) A rather bad workaround exists: still as root (i.e., after the "sudo" step) type root@raspberrypi:/home/pi# chmod 4775 /usr/bin/puredata This might be a security risk (if anyone breaks into your Pi they might be able to design an exploit to get Pd to promote them to root) but I can't say I'm worried about that. (Speaking of security though, since mine is networked and ssh-enabled, I did change the password :) I'm having no trouble running Pd via ssh from another computer. The pi user is already in group audio in the Raspian distro. X windows forwarding is also turned on by default - so the only detail you have to check is whether your ssh is rinngin with -X set on the originating machine. I did notice that one can't run pd inside sudo and still get X forwarding; you have to stay as the pi user. Then about audio. I can indeed verify that the built-in analogue audio is wretched -- in two ways. First, it's not even functional (and LOUDLY non- functional :) until you se the latency to at least 40 msec (it's 25 by default in Pd on linux.) Second, it's bad anyway. To my ears the alsa play program and Pd's test-tone sound equally bad. There's a modulation that is sort of as if a sample out of every 1024 is getting dropped or doubled. You can hear the modulation change as the pitch of the test tone goes up and down. So I pulled out my cheapo USB headset from Gigaware and, with input turned off, was able to play the test tone with latency down to 10 msec, and got a clean-sounding tone out. Then, getting overconfident, I turned on audio input and although the sound came through it has hiccups and my interface froze (had to unplug the headphones to get Pd to bail :) So things are sort of working but there's still some tuning to do... I'll probably have more to report over the weekend. cheers Miller

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packOSC integer marshalling
by Jamie Bullock 07 Sep '12

07 Sep '12

Hi list, It looks like the mrpeach [packOSC] external converts Pd floats to OSC integers if the float value is equal to the float value cast to an int. From the source code: /* It might be an int, a float, or a string */ switch (a->a_type) { case A_FLOAT: f = atom_getfloat(a); i = atom_getint(a); if (f == (t_float)i) { /* assume that if the int and float are the same, it's an int */ returnVal.type = INT_osc; Implicitly converting floats to integers based on an arbitrary rule seems a bad idea to me. Why bother making the conversion? Why not send floats as floats? It's certainly going to cause problems for some clients. For example, if the client is expecting floats on a given OSC address, it may get: 0.5 -> float 1.0 -> int ??? 1.5 -> float Which may result in dropped values or other anomalies. I am happy to send a code patch if people agree that this is a bug or at least bad design... best, Jamie

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rpi mrpeach lib
by Julian Brooks 07 Sep '12

07 Sep '12

Hey all, Does anyone have a working mrpeach library (the OSC stuff particularly) compiled for a raspian rpi pd 0.43.2? Be much appreciated if someone could share. Cheers, Julian

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modulating spectra of fm synth with another fm synth?
by umberto torrez 07 Sep '12

07 Sep '12

Hi , I was wondering how can i modulate the spectra of fm abstraction with the output of another fm abstraccion? I was wondering is there is specficic strategies for this? do anybody have tried? thanks U.

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Re: [PD] modulating spectra of fm synth with another fm synth?
by Andy Friend 07 Sep '12

07 Sep '12

Hi, You should be able to do this sort of thing by looking up LFOs in the various tutorials / manuals (eg: http://en.flossmanuals.net/pure-data/) In fact, attached is a patch with a very simple LFO assigned to the pitch of an oscillator. It should be quite straight forward to adapt this to an FM model. Just think about which part (LFO) of the FM model you want to use for the modulation. All the best

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Re: [PD] I did it, haha xenharmonic synth
by Billy Stiltner 06 Sep '12

06 Sep '12

thanks , the karplus was a last minue addition. I started with lubertdas string patch a couple years ago, added all kinds of stuff that complicated it to make a 12 string xenharmonic. took it out last year, removed all the complicated stuff and put it back in the other night. the drums are from my breakbeat collection of loops I 've been collecting since 1996. I have one of Miller's pitch shifting patches along with someone elses glitch patch I integrated with my sample player. It's not Tim Vet's glitcher but similar. > > On Wed, Sep 5, 2012 at 4:15 AM, Pierre Massat <pimassat(a)gmail.com> wrote: >> How did you do the drums track on Star 4 ? >> >> Pierre. >> >> 2012/9/5 i go bananas <hard.off(a)gmail.com> >>> >>> wow, really massive. your karplus strong synth is nice. >>> >>> _______________________________________________ >>> Pd-list(a)iem.at mailing list >>> UNSUBSCRIBE and account-management -> >>> http://lists.puredata.info/listinfo/pd-list >>> >>

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Gem gemlist_info and gemlist_matrix
by Max 06 Sep '12

06 Sep '12

dear list, i'm wondering how the gemlist_info and gemlist_matrix objects work. gemlist_info for instance has a default position of x, y, z: 0, -2.38419e-07, -13.0551 which i found strange, so i thought i'd add a translateXYZ 0 2.38419e-07 13.0551 before the gemlist_info to get reset the position to zero. but then i get 7.30032, -10.4295, -10.1628 that seems very strange to me can someone enlighten me? the gemlist_matrix-help seems very incomplete, it doesn't explain what difference of the matrix and the list is and what the output values $1…$15 are. thanks, m.

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undefined symbol: logpost
by Ed Kelly 05 Sep '12

05 Sep '12

Hi list, Setting up a new machine with Ubuntu 10.04 and Pd. When I compile externals (e.g. unuathorized) I am getting this message in the Pd window quite a lot, e.g.: /usr/lib/pd/extra/unauthorized/playlist.pd_linux: /usr/lib/pd/extra/unauthorized/playlist.pd_linux: undefined symbol: logpost What is logpost? Is this a new (Pd-0.43) thing - I started with Ubuntu studio installs of 0.42 Ed Gemnotes-0.2: Live music notation for Pure Data, now with dynamics! http://sharktracks.co.uk/

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still missing from pd
by i go bananas 05 Sep '12

05 Sep '12

after more than 10 years, i still find it amazing that pd vanilla doesn't have the following: 1) proper builtin resonant low and highpass filters. lowpass at least, come on! 2) threaded soundfiler

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[PD-announce] Installation ADM8 in Ars Electronica festival - Linz, Austria
by Jack 05 Sep '12

05 Sep '12

The installation ADM8 (Bot) will be presented in the festival Ars Electronica in Linz, Austria (30 August - 03 september). This installation is built with Pd, Gem and Java. http://www.antidatamining.net/ So We will be in Litz during this period. If you are in the area, you are welcome to visit us ;) ++ Jack _______________________________________________ Pd-announce mailing list Pd-announce(a)iem.at http://lists.puredata.info/listinfo/pd-announce

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Pd-list September 2012