November 2015 - chuck-users - lists.cs.princeton.edu

Mesh2D for Windows
by Perry Cook 27 Nov '15

27 Nov '15

Calling all Windows Hax@rs. I have discovered (thanks to someone in the online Physics-Based DSP course) that the Mesh2D chugin that’s distributed with the Windows installer is different from that shipped for Mac. (Haven’t checked Linux yet). Unacceptable behaviors include myMesh.x and myMesh.y aren’t recognized. Fix (maybe): myMesh.nx and myMesh.ny seem to be implemented instead. but the worst bug is that myMesh.noteOn won’t accept any arguments, and won’t make sound without them. Has anyone encountered this? (I think I recall some traffic on this list about it a while ago). And has anyone fixed it? And can they hook us up with a compiled executable Mesh2D.chug that we can distribute to people who need it? Thanks, PRC

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Re: [chuck-users] all pass filters (Michael Heuer)
by Perry Cook 25 Nov '15

25 Nov '15

ChucK definitely has all you need! ChucK is “DSP Complete” (like Turing Complete for computational engines/languages), because since ChucK allows for single-sample connections and manipulations, then we don’t provide lots of flavors of things. You can build from primitives. Like a RISC computer. Some things you mentioned are available: First and 2nd order AllPass are available via the PoleZero (1st) and BiQuad (2nd) UGens. You just need to set the coefficients explicitly. Tapped Delay lines can be implemented using multiple Delay elements. Yea it wastes some memory, but not too much, and works just great: // Taps.ck Tapped Delay via separate delays // by Perry R. Cook, 2015 // Caution about adc => dac!!! Use headphones Delay taps[10]; Pan2 pans[10]; for (int i; i < 10; i++) { adc => taps[i] => pans[i] => dac; Math.random2f(-1.0,1.0) => pans[i].pan; // stereo early reflections Math.random2(20,200) => int tapMs; // random path lengths tapMs :: ms => taps[i].max => taps[i].delay; 10.0/tapMs => taps[i].gain; // 1/distance gain } 10*second => now; AllPass CombFilter can be accomplished with a single delay line and one Gain connecting input to mix with output, and another Gain mixing output back into input. You might want to be cautious about the extra sample gained when feeding back, but for long delays, it doesn’t really make much difference. If you strictly want a true allpass comb, then one extra sample of delay from inlet to your main delay, feeding the fbGain back into the 2nd delay line rather than the first, should take care of it. For reverb purposes, this super simple AllPassComb might do: // Simple AllPassComb.ck by Perry R. Cook, 2015 // NOTE: this has one sample different delay forward vs. back // Easily fixed, but really doesn’t much matter for long enough delays public class AllPassComb extends Chubgraph { inlet => Delay dl => outlet; outlet => Gain fb => dl; inlet => Gain ff => outlet; 0.5 => coeff; 50::ms => delay; fun float coeff(float c) { -c => fb.gain; c => ff.gain; return c; } fun float coeff() { return fb.gain(); } fun dur delay(dur d) { d => dl.max => dl.delay; } } // Noise n => AllPassComb ap => dac; adc => AllPassComb ap => dac; // caution here, use headphones!!! 10*second => now; END

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question re. ChucK with Jack router
by Daniel Chapiro 24 Nov '15

24 Nov '15

Hi - is there a way to use ChucK with Jack, without using the miniAudicle? Thanks! --Daniel

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all pass filters
by Michael Heuer 23 Nov '15

23 Nov '15

Hello, I've been reading about various variable delay effects and reverbs recently, and as I don't understand the math and sometimes not even the terminology, I feel a bit lost. E.g. https://ccrma.stanford.edu/realsimple/DelayVar/Flanging.html https://ccrma.stanford.edu/realsimple/DelayVar/Phasing_First_Order_Allpass_… https://ccrma.stanford.edu/realsimple/DelayVar/Phasing_2nd_Order_Allpass_Fi… https://ccrma.stanford.edu/realsimple/Reverb/A_Schroeder_Reverberator_calle… As far as I can tell ChucK doesn't have some of the primitives (1st or 2nd order allpass filters, feedforward comb-filters, multitap delay) necessary for implementing these, just the STK implementations such as JCRev. I have an approximation here https://github.com/heuermh/lick/blob/master/lick/effect/APF.ck and used it here https://github.com/heuermh/lick/blob/master/lick/effect/LoopReverb.ck It seems to be doing something reverb-ish but I'm not sure what the APF delay values should be. Can anyone point me in the right direction (to code and/or reading material)? Thanks, michael

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New to Chuck - Clases and Machine.add question
by Oba Ozai 13 Nov '15

13 Nov '15

Hi, Im stuck with something simple, i cant figure out :) This works fine =>// test score // sound chain; SinOsc s => dac; // create class with a function to return midi values //given and input string class mymidivals { int result; fun int midivals (string x){ if (x == "c4") 60 => result; if (x == "d4") 62 => result; if (x == "e4") 64 => result; if (x == "f4") 65 => result; if (x == "g4") 67 => result; if (x == "a4") 69 => result; if (x == "b4") 71 => result; if (x == "c5") 72 => result; return result; } // fun }// class //define object mymidivals midivals;// create array with the melody notes ["c4","d4","e4","f4","g4","a4","b4","c5" ] @=> string song[]; song.cap() => int songcap; for (0 => int i; i < songcap ; i++) { 0.2 =>s.gain; Std.mtof(midivals.midivals(song[i])) => s.freq; 0.5::second => now; ===================================But if i put the function mymidivals on a .ck file like this //midivaltest.ck // create class with a function to return midi values //given and input string public class mymidivals { int result; fun int midivals (string x){ if (x == "c4") 60 => result; if (x == "d4") 62 => result; if (x == "e4") 64 => result; if (x == "f4") 65 => result; if (x == "g4") 67 => result; if (x == "a4") 69 => result; if (x == "b4") 71 => result; if (x == "c5") 72 => result; return result; } // fun }// class mymidivals midivals;=============================================and if call it this way, it does not work, error => undefined variable "midivals" // test score// sound chain; SinOsc s => dac;;// midivaltest.ck lives on same dir as this code Machine.add(me.dir() + "midivaltest.ck"); // create array with the melody notes ["c4","d4","e4","f4","g4","a4","b4","c5" ] @=> string song[]; song.cap() => int songcap; for (0 => int i; i < songcap ; i++) { 0.2 =>s.gain; Std.mtof(midivals.midivals(song[i])) => s.freq; 0.5::second => now; } -------------------------------------------------------any ideas ? Thanks

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Re: [chuck-users] keyboard fail
by David Loberg Code 09 Nov '15

09 Nov '15

Spencer and Bob, The problem is not exclusively an El Capitan issue. It was already happening in Yosemite before she upgraded. We have tried other device numbers. If it is a correct device number, it will open the keyboard but not receive data. If it is an incorrect device number, it gives the 'couldn’t open' response. (As I indicated, we also tried connecting an external USB keyboard.) davd Fra: Bob Bob <estecorreoesdebobi(a)gmail.com> Emne: Re: [chuck-users] keyboard fail Dato: 31. oktober 2015 01:10:39 GMT-4 Til: ChucK Users Mailing List <chuck-users(a)lists.cs.princeton.edu> Svar til: ChucK Users Mailing List <chuck-users(a)lists.cs.princeton.edu> I've hesitated to update to el capitan because a lot of people have been having issues. I also have the latest MacBook pro but 15" and everything works so far. 2015-10-28 19:06 GMT-06:00 Spencer Salazar <spencer(a)ccrma.stanford.edu>: Hi David, I will test this on my end also but some times an OS version update will introduce "ghost" HID's, especially keyboards or trackpads, that can be opened but do not generate data. This has happened a few times before. The way to check is to change the kbNum and see if using a different number (1, 2, 3, etc.) produce data. You only need to try this until you see "couldn't open keyboard #" for whichever number after 0, which means you've exhausted the list of things ChucK thinks is a keyboard. Otherwise this could be a new issue specific to El Capitan :( spencer On Wed, Oct 28, 2015 at 11:16 AM, David Loberg Code <d.loberg.code(a)wmich.edu> wrote: I have a student with a MacBook Pro (Retina, 13", early-2015). She was on Yosemite with latest ChucK build; now on El Capitan with the ChucK beta build (1.3.5.2 beta). The same problem happened in both builds. She can open the keyboard with Hid. It will successfully pull the kb.name and print it. However, it won’t detect any other activity from the keyboard. It gets stopped at kb=>now; and won’t go any further. We have tried an external USB keyboard too, and it produces the same problem. Anyone else have this happen OR have a cure? thanks, davd David Loberg Code Western Michigan University code(a)wmich.edu Hid kb; HidMsg kbMsg; 0 => int kbNum; kb.openKeyboard( kbNum ) => int kbAvailable; if ( kbAvailable == 0 ) me.exit(); <<< "keyboard '", kb.name(), "' ready" >>>; while (true) { // hangs up waiting for kb=>now event kb => now; while(kb.recv(kbMsg)) { if (kbMsg.isButtonDown()) { kbMsg.key => int keyNum; <<< "#", keyNum >>>; } //end button down } // end while hid.recv } // end while(true) davd David Loberg Code School of Music Western Michigan University 1903 W Michigan Ave Kalamazoo, MI 49008-5434 code(a)wmich.edu

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chuck + chugins + ladspa plugins in docker?
by Michael Heuer 06 Nov '15

06 Nov '15

All, Has anyone tried to install chuck + chugins + LADSPA plugins into a Docker image? I lost and replaced some Mac hardware and am not looking forward to going through all the trouble necessary to build all this stuff on OSX again, e.g. Joel Matthys' Fork of CCRMA ChuGins https://github.com/jwmatthys/chugins the C* Audio Plugin Suite http://quitte.de/dsp/caps.html TAP-plugins http://tap-plugins.sourceforge.net/index.html Computer Music Toolkit (CMT) http://www.ladspa.org/cmt The SWH Plugins package for the LADSPA plugin system http://plugin.org.uk/ Rubber Band Library http://breakfastquay.com/rubberband/ If anyone has experience with Docker on Raspberry Pi or BeagleBone Black, that would be interesting to hear about too. Thanks, michael

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Re: [chuck-users] kb hid problems
by Perry Cook 01 Nov '15

01 Nov '15

This is really odd, because I have two Yosemite machines that work fine with your posted code. I’m trying to figure which of my Macs I want to subject to the ElCap upgrade, and will test on that and report. For fun, have you tried the other non-hid keyboard device example? This one suffers from not working on Windows, but uses a non-hid path without requiring device number, etc. // computer keyboard input via terminal KBHit kb; // time-loop while( true ) { // wait on event kb => now; // loop through 1 or more keys while( kb.more() ) { // get and print key... kb.getchar() => int c; <<< "ascii:", c >>>; } }

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