January 2009 - chuck-users - lists.cs.princeton.edu

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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Library-Like Code
by mike clemow 31 Jan '09

31 Jan '09

Hey all, I just posted some very primitive (pun intended) Iterator classes for arrays of Ints and Floats. (http://wiki.cs.princeton.edu/index.php/Chuck/Lib) I find them useful in certain situations. (I think Michael Heuer has some superior ArrayList / Iterator code somewhere.) Now, I'm well aware that most of you have personal class libraries that you use to do your thing with Chuck (I do too). There are also collections of code out there focusing on specific domains (SMELT, etc). I wonder about all this code and whether or not there might be some willingness to curate (for lack of better word) a collection of library-like code that we might post somewhere--in some package that isn't code posted on a wiki. It's not really a class library... it's not really package... it's more like a distribution. But I think that it would be really helpful and fun. There's something about posting code to the wiki that really makes me cringe. Documentation of code is really what wiki's are good for. I think that a downloadable collection with wiki documentation would be ideal. I know that this couldn't be any sort of rigorously designed library, but we could all incrementally contribute to something like this, which I think would be really sweet. Is anyone into this idea? I'd be glad to set up the chuck/lib page on the wiki to this end and organize, if people are into it. -Mike -- http://michaelclemow.com http://semiotech.org

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syncing computers with OSC
by james.hurlbut＠utoronto.ca 29 Jan '09

29 Jan '09

Hi, chuck newbie here. I am wondering what the best way to get sample accurate sync between two laptops. I have tried using http://music.princeton.edu/~dan/plork/autosocket_chuck.zip but the two computers receive the 16th beats at slightly off times. I also have tried sending an osc message every sample or 100 samples but that completely bogs down the machine. Is the solution to have one machine do all the audio and another just send program changes? Thanks, James

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Parallel Shreds
by Eric Hedekar 29 Jan '09

29 Jan '09

Hi, I'm just curious as to how parallel chuck's processing actually is? I've read in the ICMC2003 paper that "ChucK is a concurrent language, which allows multiple independent paths of computation to be executed in parallel." That implies (to my ear anyway) that ChucK allows each shred to run on it's own processor core in a multi-core processor. Is this the case, or is it merely an 'illusion of parallelism' whereby the parallel processing is merely a higher-level construct of shreds advancing time on their own accord in the VM? Any info would be greatly appreciated. Thanks. -Eric Hedekar -- _______________________________________ http://greyrockstudio.blogspot.com

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this wont work in 1.2.1.2
by Atte André Jensen 29 Jan '09

29 Jan '09

Hi I'm trying to make my huge live-thingy run under 1.2.1.2. I've narrowed the first problem down to the following code, that runs fine in 1.2.1.1b but segfaults in 1.2.1.2. Any input on what's changed and how to make the sniplet work in 1.2.1.2 would be greatly appreciated! public class Time { new Shred @=> static Shred @ ticker_shred; public static void start(){ spork ~ ticker() @=> ticker_shred; } public static void ticker(){ while(true){ 1::ms => now; } } } Time dummy; dummy.start(); 100::week => now; Thank in advance for any feedback. -- Atte http://atte.dk http://modlys.dk

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a bit about my chuck live system
by Atte André Jensen 29 Jan '09

29 Jan '09

Hi I posted this deep in the "this doesn't work" thread, thought it might be better to start a new topic. This is in response to those who expressed interest in discussing home-brewn chuck live systems, so here follows a short description of mine. First I must tell a little bit about the kind of music that I'm doing in this particular project. It's obviously electronic, but not very loop based. Although it's not pop it uses to some extend the pop forms like intro, verse, chorus. Also it has chord changes like a pop song, and those changes might be different for each song part. And finally it involves a double bass player and a singer (besides me and a vj). Maybe it's time for some music. These are the first two tracks of the first concert with chuck. They might be representative of what I do live, something algorithmic, something prepared, something weird (for the regular listener) and something poppy. Notes 1) The thing blowing up between tracks is my micron, 2) the muddy sound on the vocals should be better next time, 3) besides the vocal the bass and the blow-up in the transition everything is chuck. http://atte.dk/download/01_train.mp3 http://atte.dk/download/02_holde_pkt.mp3 One of my main motivations was to be able to make something that is flexible like a real band. I want to be able to jam with it, take the dynamics down, repeat a part, stay on a part, and play solo (either with synth, game pad or melodica) over it. With this small band I soon felt it would be a waste of my hands and mind to simply play any single part unless it would be possible to modulate the whole piece dramatically with that specific part. In stead my role is to modulate the whole "band", kind of like a director, deciding in real time which part comes next, taking certain instruments out and controlling the music in more general terms. Everything is controlled from a bcr2000, and I play a little on a keyboard and a game pad. So my system lets me program "patterns" like a synth part, or a drums part, each of which is a single .ck file. They have a degree of either randomness to them or are actual algorithms that spin out eternal variations. Each of them "listens" to the settings of various knobs like dynamic (how loud to play), height (chose notes in either lower or higher register), length (play short or long notes) and activity (play less or more). Each part goes into an eight channel mixer with delay (with controllable delay time and feedback) and a controllable filter. I make some abstractions on time (this was where my segfault occurred), like: Time.wait(4); which means "wait for the next quarter-note" or if(Time.sub(8)%2 == 1) which means "if we're now on one of one-and, two-and etc. Basically the system works very well, but it takes practice. Not only can it be tricky to actually press the right button at the right moment, but it demands alot to be able to shape an eight minute piece from beginning to end with a satisfying structure and a natural climax not only so that the piece itself comes out right but also so that it fits within the entire set, which lasted about 50 minutes (next gig will have more new songs, so we're doing two sets of about 35-40 minutes). I hope this gives you an idea of what I do and why. Of course this explanation leaves out a lot of details, and the systems does a bit more here and there, but that's basically it... -- Atte http://atte.dk http://modlys.dk

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thought everyone might want to check this out
by Alpha Core 28 Jan '09

28 Jan '09

Hello to Everyone, I Have just Beta launched the Rails Text2midi Music Application This site will soon allow complete on line collaboration and more instruments Just trying to get feedback and Ideas of what people like to see in future Updates to this site.. so come by generate a Song or to and share with other fellow musicians http://text2midi.herokugarden.com Thank for taking the time and support Alpahcore

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chuck --probe doesn't find USB midiman keyboard?
by Robert Poor 27 Jan '09

27 Jan '09

[insert gratuitous ravingly happy chuck comment here] I'm a brand new user, so this may be a simple cockpit error. I've plugged in a midiman "oxygen 8" clavier keyboard into my Mac Powerbook G4. The Mac recognizes the clavier keyboard in System Profiler... =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Vendor-Specific Device: Product ID: 0x1014 Vendor ID: 0x0763 (M-Audio) Version: 0.01 Speed: Up to 12 Mb/sec Location ID: 0x1b100000 Current Available (mA): 500 Current Required (mA): Unknown (Device has not been configured) =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= ... but chuck --probe does not: =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= [poorbook15-5:chuck-1.2.1.2-exe/examples/midi] r% chuck --probe [chuck]: found 1 device(s) ... [chuck]: ------( chuck -- dac1 )--------------- [chuck]: device name = "Apple: Built-in Audio" [chuck]: probe [success] ... [chuck]: # output channels = 2 [chuck]: # input channels = 2 [chuck]: # duplex Channels = 2 [chuck]: default device = YES [chuck]: natively supported data formats: [chuck]: 8-bit int [chuck]: 16-bit int [chuck]: 24-bit int [chuck]: 32-bit int [chuck]: 32-bit float [chuck]: 64-bit float [chuck]: supported sample rates: [chuck]: 32000 Hz [chuck]: 44100 Hz [chuck]: 48000 Hz [chuck]: [chuck]: ------( chuck -- 0 MIDI inputs )------ [chuck]: [chuck]: ------( chuck -- 0 MIDI outputs )----- [chuck]: [poorbook15-5:chuck-1.2.1.2-exe/examples/midi] r% =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Any ideas what's required to get Chuck to honor the USB / Midi keyboard? Thanks. - Rob

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Congratulations => Perry;
by Ge Wang 21 Jan '09

21 Jan '09

Dear all, Perry has been recognized as one of the 44 ACM fellows in 2008, "for contributions to computer music, physics-based sound synthesis and voice analysis/synthesis." http://fellows.acm.org/fellow_citation.cfm?id=4412276&srt=year&year=2008 Congratulations Perry!!! Ge!

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parent and children classes
by eduard aylon 21 Jan '09

21 Jan '09

Dear chucklist, I have a question regarding parent and children classes. I'm building a patch with operators that may have one or anoother user defined envelope (i.e. gaussian like, percussive like, etc.). I want to avoid to have to define each operator with 4 different envelopes and then connect-disconnect-reconnect. What I would like is to define a parent class EnvelopeClass from which the rest can inherit. I remember from the past that in chuck inheritance is not very "handy", so if children have different functions or members than its base class, these cannot be accessed. Does anybody have good recommendations to this problem? So the idea is: EnvelopeClass -> this is the base class GaussEnvelope -> children class that inherits from EnvelopeClass PercussiveEnvelope-> children class that inherits from EnvelopeClass now I'd like to have class Operator { SinOsc s; EnvelopeClass @ env; } and be able to assign different envelope types and be able to access their members. Maybe the example at the bottoom of the email is more explanatory. Operator op; GaussianEnvelope gaussEnv @=> op.env; Operator op2; PercussiveEnvelope percEnv @=> op2.env; and even later be able to change the type of the envelope for any operator: GaussianEnvelope gaussEnv2 @=> op2.env; From what I remember, the trick would be that parent and children classes have EXACTLY the same member vars and functions although the implementation contained in it may differ. However, a gauss envelope or a percussive envelope have very different demands, and the best would be to be able to have diffferent implementations for each but inherit from the same base class. any thoughts are very much appreciated, thanks eduard Another example could be: class operator { UGen @ ugen; } Operator op; SinOsc s @=> op.ugen; // this is fine so far but none of the functions of sinosc can be accessed 220 => op.ugen.freq; // this throws an error, as far as I remember....

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