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

Problems with qubes
by Luca Sangiacomo 19 Feb '16

19 Feb '16

Hi there, I'm having trouble installing chuck and with miniAudicle. I'm using Qubes os, so I'm running the code in a VM. miniAudicle can see the audio interfaces, but it freeze a couple of seconds after I start the chuck vm. Chuck doesn't output any sound and or warning. I have tried to compile with linux-pulse. Compiling with linux-alsa doesn't solve the problem. The sound is working fine (tested playing a wav by shell) Tnx.

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MOOC of interest to ChucK users: Machine Learning for Musicians and Artists
by Rebecca Fiebrink 03 Feb '16

03 Feb '16

Hi everyone! I am teaching a MOOC (online class) called "Machine learning for musicians and artists,” and it has just opened: https://www.kadenze.com/courses/machine-learning-for-musicians-and-artists/… <https://www.kadenze.com/courses/machine-learning-for-musicians-and-artists/…> This class grew out of work that I've done with a number of computer music composers and music technology students, many of whom are ChucK users, and I hope it will be helpful to you. If you’re interested in machine learning for building new musical instruments or other real-time creative interactions, please sign up. No prior machine learning knowledge or mathematical background is necessary. The course is probably most interesting for people who can already program in some environment, because it allows you to connect code you write in languages like ChucK to machine learning algorithms as well as sensors, other software and hardware, etc. But the class should still be accessible to people who don’t program. I’m thrilled to be joined by two guest lecturers, music technology researcher Baptiste Caramiaux and composer/instrument builder/performer Laetitia Sonami. You can watch the lectures and access all the course content for free, or pay a small monthly subscription to also submit & get feedback on assignments. (FYI many familiar ChucK faces have been involved in Kadenze, including Spencer Salazar and Perry Cook, and Perry has a sound synthesis class there as well.) Please share widely with interested friends/colleagues/students! Best, Rebecca

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Announcing MIDIFlower
by Gregory Newsome 07 Jan '16

07 Jan '16

Hi chuck-users, I’d like to announce the release of MIDIFlower, a lightweight MIDI input framework for ChucK. MIDIFlower listens for and routes incoming MIDI data to your ChucK instruments. It’s particularly useful for those who use ChucK with a MIDI controller. With MIDIFlower, you’ll focus more on your instrument code, and less (or not at all) on MIDI input boilerplate. https://github.com/GLN/MIDIFlower Feedback welcome! GLN — Gregory Lee Newsome Lecturer, Digital Composition Faculty of Music University of Toronto greg.newsome(a)utoronto.ca<mailto:greg.newsome@utoronto.ca> http://gregoryleenewsome.ca/

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ChucK, Audio, MIDI courses posted online
by John Ellinger 28 Dec '15

28 Dec '15

Hi All, I've posted courses I created and taught in the Carleton College Music Department before I retired in 2014. MUSC 101 - Music Fundamentals http://people.carleton.edu/~jellinge/m101s12/index.html The basic fundamentals of music in a web based format using the MiBAC MUSIC LESSON I and MUSIC LESSONS II I wrote during the 90's and 00's. Sadly the business closed in 2012 after 25 years. MUSC 108 - Intro to Music Technology http://people.carleton.edu/~jellinge/m108f13/index.html The focus of this course was learning to "play the computer" with attention to articulation, dynamics, phrasing, rhythmic accents that a performer would use. The first half of the course taught the raw language of MIDI and the format of Standard MIDI Files using Excel spreadsheets. Students used a utility program I wrote called MIDIDisplay that translated the Excel text into MIDI messages they can play and edit. There is also an Excel template for a SMF that, when filled in correctly and pasted into MIDIDisplay, will export the text as a Standard MIDI File. The second half of the course applied that MIDI background to creating a "human" MIDI performance using Apple's Logic 9. MUSC 208 - Computer Music and Sound http://people.carleton.edu/~jellinge/m208w14/index.html The focus of this course was the study of Computer Sound. The primary programs were ChucK and Octave with a little OSC and Processing GUI connected to ChucK at the end. The lectures were geared to teaching students enough about synthesis methods, a little filter theory, and a lot of controlling ChucK with laptop keyboards, gamepads, joysticks, and Golftrak string controllers. There were three student project, and individual research presentation, and two laptop trio performances (7 groups of three students each). There are a lot of code examples designed to give the students tools to create their projects. I deliberately inserted the code as images to prevent students from copying and pasting. I felt typing the code forced them to slow down, think and ask questions. The course was taught as a 110 minute lab every Tuesday and Thursday. My DIY Modular Synth http://people.carleton.edu/~jellinge/mysynth.html This is an analog Modular Synth I recently built using schematics mostly from Electronotes by Bernie Hutchins. http://electronotes.netfirms.com/ Special thanks to Dan Trueman, Ge Wang, Spencer Salazar, Perry Cook, Steve Beck, Roger Dannenberg and the many other people I met at the 2012 SLEO conference at LSU who patiently answered my questions when I was just getting started with ChucK. That enabled me to coach Carlork the Carleton Laptop Orchestra in 2013 and create MUSC 208 which I taught twice in 2013 and 2014. Comments, questions welcome. John John Ellinger Winter 2016 Visiting Instructor in Computer Science CS 312 Audio Programming in C++ Senior Lecturer in Music, Retired Carleton College http://http://people.carleton.edu/~jellinge/

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input to UGen?
by Michael Heuer 07 Dec '15

07 Dec '15

Is it possible to query whether a UGen has an input or not? If anything has been chucked to it, in other words. Thanks, michael

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kb hid problems
by David Loberg Code 07 Dec '15

07 Dec '15

Yes, we tried KBHit. That works fine. Still can't resolve the problem with using Hid. As I said, it recognizes the keyboard device exists (i.e. will connect to it), but doesn't recognize that it is producing any data. Perry Cook prc at CS.Princeton.EDU Sun Nov 1 13:21:53 EST 2015Next message: [chuck-users] keyboard failMessages sorted by: [ date ] [ thread ] [ subject ] [ author ]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 >>>; } } davd David Loberg Code School of Music Western Michigan University Kalamazoo, MI 49008

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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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