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

Introducing the KNoW Wave Generator
by Les Hall 22 Feb '09

22 Feb '09

Hello ChucK fans, <begin = "shameless self promotion"> I'd like to tell you about my newest way cool ChucK program, 700 lines of automatic music-generating fun! You can read all about it on the ChucK forum here: http://electro-music.com/forum/viewtopic.php?p=228469#228469 Well, it's actually under the composition sub-forum, not the ChucK sub-forum, but there you go. Source code and sample audio file included, so have a look. I've gotten several compliments from music folks about it, so I think you will like it. Comments and suggestions are welcome as always. <end = "shameless self-promotion"> Les (Inventor)

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Literature 2 Music has been Launched...
by Alpha Core 22 Feb '09

22 Feb '09

Hello Everyone, I have finally deployed Literature 2 Music a rails music composing application. This application takes literature aka text and converts it into a music composition that can later be used to in any software synth... www.literature2music.com Compose share & Enjoy... Thanks for your time and support.. Gabriel G

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Summer DSP Course (in ChucK)
by Ge Wang 21 Feb '09

21 Feb '09

Dear all, Perry and I will be teaching a 1-week intensive summer course on Sound Synthesis and Digital Signal Processing in ChucK, to take place from July 6th - July 10th, at CCRMA, Stanford University. The course fee is $650 and includes the course textbook "Real Sound Synthesis for Interactive Applications" by Perry (see below for more information). Should be fun! We sincerely hope you can join us! All the best, Perry and Ge! --- Here is more information: http://ccrma.stanford.edu/workshops/2009/ July 6-10 Sound Synthesis and Digital Signal Processing in ChucK Perry Cook, Ge Wang Description: This 1-week course will introduce basic concepts in sound synthesis, digital signal processing, and programming in the ChucK language. This workshop is intended for: If you know programming (C, Java, C++ Objective C, etc.) then you'll know ChucK thoroughly by the end of this course. If you don't, then you'll know some programming and some ChucK. If you have math background, then you'll know quite a lot of DSP by the end of this course. If not, then you'll have an intuitive grip on many of the concepts. If you know DSP but not physical modeling or other sound synthesis techniques, then you'll know those by the end of the course. Workshop structure: Morning lectures will cover time and frequency domains, additive, subtractive, FM, and physical modeling synthesis, and basics of ChucK programming. Afternoon labs will reinforce course topics through hands-on exercises and individual work based on participant interests. Text: Real Sound Synthesis for Interactive Applications (included in course fee).

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idiom for requiring a class file?
by Robert Poor 18 Feb '09

18 Feb '09

More questions: What's the proper ChucK idiom for automagically loading a class file from a file that uses that class? I can manually add MyClass.ck to the VM before loading the calling file, but that doesn't seem particularly scalable. Is there an idiom that is equivalent to "include" or "require" in other languages? - Rob

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recording audio input under ChucK control
by Robert Poor 18 Feb '09

18 Feb '09

fellow chukka's: I have not yet found an obvious way to record audio input under ChucK control. The SndBuf.write() method is documented as "not yet implemented", and test code appears to confirm that it isn't implemented. I want to use ChucK to record snippets during a live performance using MIDI input to control when the recording starts, then use ChucK to play back processed snippets. I *really* don't want to be switching apps (more specifically -- I don't want to be fiddling on a Mac keyboard), so I need Chuck to control it all. So my gambit -- yet to be tested -- is to use ChucK to spawn a command line function to do the recording, such as: def void recordSnippet(string toFilename) { system ("sndrecord " + toFilename); } ... where sndrecord is a command-line recorder (such as /Developer/ Examples/CoreAudio/Services/AudioFileTools/afrecord). Questions, always questions: - Given my constrains (real-time recording must be controlled from a MIDI device, not from a Mac keyboard) is this a sensible approach? How have other people managed this? - in the ChucK system() call, is there a way to attach to stdin / stdout of a spawned process? In this particular case, I would like to send it a string to stdin of the spawned process to tell it when to stop recording. - Aside from the afrecord utility in Mac OS /Developer, are there other command-line recording apps that people use and like? Thanks. - Rob

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dur frame?
by Kassen 17 Feb '09

17 Feb '09

Fellow ChucKists, suppose we have a stream of data coming in over HID (or MIDI or whatever). Suppose we wish to have something done based on the data that came in over the last frame and we want to make sure this gets done before the next frame starts and hence before any new data could come in. This would be useful to create smooth transitions based on HID data at the expense of lagging one frame. How would we go about this? I don't think we can without introducing "magic numbers" based on our settings. I'd like to propose the introduction of a duration named "frame" of a length of a "n::samp" where n is the size of a single frame in samples. Yours, Kas.

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Timing with ChucK
by rkramer 17 Feb '09

17 Feb '09

Being a relative non-programmer, I'm not quite sure if this is even possible... My goal is a quick and dirty program that will measure the time between two large audio events (in the input sound buffer, live recording.) Essentially what I want to do is use ChucK for practical demonstrations of simple physics... IE demonstrating average velocity of a falling object (that generates a sufficiently loud event when it is released and when it hits the floor.) Any tips where to start on this project? Ryan

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ChubbY (ChucK in Ruby)?
by Robert Poor 13 Feb '09

13 Feb '09

Has anyone considered of implementing all the wonderful functionality of ChucK in Ruby? I'm not trying to start a fight or ruffle feathers -- it's an honest question. I love ChucK for all of its functionality -- it has a full house of great unit generators and signal processing objects coupled with an easy-to-use thread / scheduling mechanism. But for all that, I find ChucK the language lacking. For example, when I really push on defining classes, I can't do all the things I'm used to. Might not a marriage of ChucK's rich functionality with Ruby's rich language be nearly ideal? At the very least, we'd get Mr. Bowkett to -- in Yoda's words -- TFSU. - Rob

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Re: [chuck-users] determining the type of an Object in code
by mike clemow 12 Feb '09

12 Feb '09

Hello, fellow Chuckers! I keep finding myself returning to this issue of trying to determine the class of an object instance at runtime. We talked about it here: https://lists.cs.princeton.edu/pipermail/chuck-users/2008-September/003242.… I recently pulled from CVS and started fooling around and discovered a remarkably simple hack. There's a method in Object, toString(), which returns a string containing the class of the object as well as the reference ID. Like this (supposing a class called "Test"): "Test:11ceff0" There's also a stub in chuck_lang.cpp for a method getType(), which isn't implemented (yet). So, I copied the implementation of toString(), minus the printing of the reference ID, and placed it where the implementation of getType() should be. Now all objects (not UGens yet, although that would be sweet) respond to getType(). Example: class Test { 5 => int i; fun void sayHi() { <<< "hi" >>>; } } Test test; test @=> Object o; // Object still knows it's a Test! <<< o.toString() >>>; <<< o.getType() >>>; // Object can't sayHi() //o.sayHi(); // but this is now possible if( o.getType() == "Test" ) { (o $ Test).sayHi(); } The above code will print this: "Test:11cf160" : (string) "Test" : (string) "hi" : (string) This makes me very happy and opens up many doors, although I have no idea what getType() was originally intended to do--I assume a similar purpose. I'm sure that this will work as a mod to the current release as well, although I made my changes in the CVS version (I'm excited for FileIO). This ought to make implementing things like ArrayList a lot easier. ;-) I consider this a feature request (for this or something like it). I think this would be super helpful for UGens and primitives also. Primitives, however, don't support the dot notation... Oh well. I'll take what I can get. -Mike -- http://michaelclemow.com http://semiotech.org

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cheap parallel ChucKing
by Graham Percival 10 Feb '09

10 Feb '09

Hi all, We're using ChucK as a cheap synthesizer for a bunch of new electronic instruments. To make best use of the dual-core CPU, we're launching ChucK in two separate threads: $ chuck first-server.ck & $ chuck second-server.ck This works great (it almost maxes out both cores on a mac mini), although the second instance of chuck complains that it can't bind to port 8888. Are there any potential pitfalls to this method? I know that we can't (easily[1]) get any communication between these two chuck instances, but in this case we don't need it -- each instrument's synthesis is completely independant of the other one. In CS terms, this problem is "embarrasingly parallel". :) [1] we could add code to our OSC servers to send messages back and forth via loopback, which isn't precisely "hard", but it's not as easy as everything else we do in ChucK -- this language is awesome. :) Cheers, - Graham Percival

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