February 2020 - chuck-users - lists.cs.princeton.edu

Chunity (ChucK for Unity): Release!
by Jack Atherton 29 Jul '22

29 Jul '22

Dear all, Hello! I'm happy to announce the initial official release of Chunity (ChucK for Unity)! http://chuck.stanford.edu/chunity/ http://u3d.as/1bvM Chunity is the integration of ChucK in Unity. (For those of you not familiar with the Unity game engine, Chunity gives you the ability to do realtime sound + music generation natively in Unity, tightly coupled to interactions with graphical objects.) You can use most (possibly all?) ChucK features, run new ChucK code on-the-fly at any time, and communicate between Unity and ChucK using "global" (new keyword!) ints, floats, strings, Events, and 1D int and float arrays. (More types to come!) You can even run multiple VMs that share the same strong timing! Check out this video of things people have already made with Chunity: https://vimeo.com/263613454 And check out the original description of Chunity in this NIME paper: http://chuck.stanford.edu/chunity/files/2018-nime-chunity.pdf We want to know what you all do with this! Please feel free to send works in progress, bug reports, feature requests, finished works, etc. to the chuck-users mailing list! We are also planning to send a sparse series of follow-up emails covering tutorials, new features, and cool projects that people in the community have created. Please see the tutorials, documentation, etc. at the official Chunity website: http://chuck.stanford.edu/chunity/ Thank you and happy ChucKing!! Best, Jack + the ChucK team Music:Computing:Design @ CCRMA

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smoothing and scaling RMS data
by Andrew Telichan Phillips 29 Feb '20

29 Feb '20

Hello, I'm wanting to capture the amplitude envelope from a live source and generate feedback loops... I'm starting by obtaining RMS values, as per the examples on the home site: https://chuck.cs.princeton.edu/doc/examples/analysis/features/rms.ck First, does anyone have a preferred way of filtering the data that effectively captures transients and smoothes the decay? Second, is there a way to scale the range of this smoothed data - that is, map it onto a defined range to use as a parametric control for another UGen? While I'm at it, does ChucK have a filter for DC leak? I'm new to ChucK and am used to work, so I appreciate any help (and patience).

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overloading (assignment) operators
by mario buoninfante 28 Feb '20

28 Feb '20

Hi all, I think I know the answer, but I'd like to ask the question anyway since it could trigger interesting discussions. Is it possible to overload operators in ChucK? I was thinking about having something like the following: private class PInt { 0 => int value; function void __chuck__ (int x) // or PInt operator=> (int x) { x => this.value; } } so that then, assuming I have a PInt instance MyInt, I can just do something like that: 12 => MyInt; Cheers, Mario -- electronic musician, sound artist, creative coder, QA engineer https://vimeo.com/creativecodingsalerno http://mbuoninfante.tumblr.com/ https://github.com/mariobuoninfante https://bitbucket.org/mariobuoninfante/

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Clipping using multiple SndBuf files
by Matthew.Noone 28 Feb '20

28 Feb '20

Hi, I'm just wondering the best way to avoid clipping when using multiple SndBuf files in code? I'm making a composition using machine.add script and there is a lot clipping when the new scripts come in. Is the best thing to add Envelopes in the individual codes? Or is there some better way? Thanks, M Dr. Matthew James Noone Sarode Artist & Irish Research Council Postdoctoral Fellow Irish World Academy of Music and Dance University of Limerick

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SndBuf .interp has no effect on smoothness
by herman verbaeten 28 Feb '20

28 Feb '20

Hi, I was told that in order to smoothen my slow-rated sample playback i should use .interp. In the script i added it but I don't hear any difference. Help! me.sourceDir() + "sound.wav" => string filename; if( me.args() ) me.arg(0) => filename; SndBuf buf => dac; filename => buf.read; 2 => buf.interp; .2 => buf.rate; buf.length() => now; // play him 1::ms => now; // wait a bit 1 => buf.loop; // loop homer now buf.length() => now; // for 2 seconds .1 => buf.rate;

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Re: [chuck-users] SndBuf use of .loop and .interp (herman asked)
by Perry Cook 27 Feb '20

27 Feb '20

.interp doesn’t do what you think it does. It just specifies the type of internal interpolation for smoothing of playback (only applicable for non 1.0 rates). SndBuf .loop just tells it to start over at the beginning when it reaches the end (or end after reaching the beginning): SndBuf s => dac; "special:dope" => s.read; // load homer s.length() => now; // play him second => now; // wait a bit 1 => s.loop; // loop homer now 2*second => now; // for 2 seconds -1 => s.rate; // then play him backward 2*second => now; // for two more If you need to loop a specific piece of a sound in SndBuf, you should either: edit that in a sound editor and save/ it as a new file. Figure out the exact sample points within the wave that should be your start and end loop points. Then use .pos and => now to loop it. You don’t even need .loop mode for that, because it will keep playing as long as the start is within the buffer boundaries. If you want smooth looping without pops at the edges, you could maybe use an ADSR to smooth the beginning and end. Not sure of your application here, but SndBuf is not a flexible sample playback UGen that knows about loops like a SoundFont player would. PRC > From: herman verbaeten <hverb54(a)hotmail.com> > > Hi, > > In my attempt to loop-play 1 portion of the soundbuffer for a certain periode time(2000 milliseconds in my example) i get a kind of clicking when the geginning of the sample pos is different from the ending.. > Maybe .loop and .interp of SndBuf is a solution here. Anyone who knows how to use them? > Kind regards, > Herman > > me.sourceDir() + "aeiou.wav" => string filename; > if( me.args() ) me.arg(0) => filename; > SndBuf buf => dac; > filename => buf.read; > > fun void looper() > { > while(true) > { > 1500::samp => now; > 50000 => buf.pos; > }} > spork ~ looper(); > > 2000::ms => now; >

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Re: [chuck-users] Global Variables (herman asked)
by Perry Cook 27 Feb '20

27 Feb '20

You script got scrubbed for some reason, but I suspect that you’re shadowing the global somehow locally (if you use the same name as an argument or a local within a function, it masks the global version). Here’s a simple example of using a global: 1000 => float freqGlob; // global frequency variable SinOsc s => dac; // note that this osc is treated globally as well spork ~ sweep(); while (true) { // main loop randomly (re)sets freq Std.rand2f(500.0,3000.0) => freqGlob => s.freq; Std.rand2f(0.3,1.0)::second => now; } // this shred sweeps the frequency exponentially down fun void sweep() { while (true) { (0.999*=> freqGlob) => s.freq; ms => now; } }

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inter-shred communication - using global
by herman verbaeten 27 Feb '20

27 Feb '20

Hi, In " ChucK : Language Specification > Concurrency & Shreds" i read about using global variables. Unfortunately i don't succeed changing the variables in a way that the function uses this changed value of the variable. It keeps on using the old (initial) value of this variable. What am i doing wrong?? This is my script:

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SndBuf use of .loop and .interp
by herman verbaeten 26 Feb '20

26 Feb '20

Hi, In my attempt to loop-play 1 portion of the soundbuffer for a certain periode time(2000 milliseconds in my example) i get a kind of clicking when the geginning of the sample pos is different from the ending.. Maybe .loop and .interp of SndBuf is a solution here. Anyone who knows how to use them? Kind regards, Herman me.sourceDir() + "aeiou.wav" => string filename; if( me.args() ) me.arg(0) => filename; SndBuf buf => dac; filename => buf.read; fun void looper() { while(true) { 1500::samp => now; 50000 => buf.pos; }} spork ~ looper(); 2000::ms => now;

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ChucK as LV2 or AudioUnit v3 plugin?
by Michael Heuer 25 Feb '20

25 Feb '20

Hello, Given recent linux-based hardware platforms that rely on the LV2 plugin interface https://www.kickstarter.com/projects/modduo/mod-dwarf <https://www.kickstarter.com/projects/modduo/mod-dwarf> https://shop.zynthian.org/shop/product/zynthian-bundle-all-kit-v3-326?categ… <https://shop.zynthian.org/shop/product/zynthian-bundle-all-kit-v3-326?categ…> and that libchuck is effectively dead-on-arrival as of recent iOS versions (something about standard system calls no longer allowable, if I remember correctly) https://github.com/mgyucht/libchuck <https://github.com/mgyucht/libchuck> Is there any interest in adapting ChucK to the LV2 plugin interface for linux or the AudioUnit v3 plugin interface for iOS and OSX? Ge, might open sourcing work done at SMULE for iOS be a possibility? Another target interesting to me is VCVRack, which has its own plugin interface https://github.com/VCVRack/Rack <https://github.com/VCVRack/Rack> https://vcvrack.com/manual/PluginDevelopmentTutorial <https://vcvrack.com/manual/PluginDevelopmentTutorial> Cheers, michael

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