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

bandwidth in band reject filter
by Michael Heuer 27 Oct '14

27 Oct '14

Hello, I'm currently using the C*APS Eq10 10-band equalizer http://quitte.de/dsp/caps.html#CAPS_for_Electric_Guitar via the LADSPA ChuGin https://github.com/jwmatthys/chugins as part of an effect but all I really need is something to scoop the mids. I thought I might use the BRF band reject filter http://chuck.cs.princeton.edu/doc/program/ugen_full.html#BRF I can't tell how to set the bandwidth (or described another way, the range of frequencies around the center frequency that are rejected by the filter). I went off into reading Miller Puckette's book Theory and Techniques of Electronic Music http://msp.ucsd.edu/techniques.htm and am now lost somewhere in the imaginary plane. The definition of the Q parameter seems to vary among the different ChucK filters (resonance vs quality vs Q) and I suppose I should understand what that means. Feel free to tell me to go back to my reading. :) michael

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Identifying special keys (e.g control, alt, arrow keys)
by Will Hardwick-Smith 27 Oct '14

27 Oct '14

I'm interested in making a ChucK program which responds to key presses to assist users' typing. Using ascii codes from HidMsg.ascii, I can differentiate between many keys, but not some keys like the arrow keys, (on windows) control, alt, shift, tab, home, end and some others. I wasn't able to find documentation for the Hid or HidMsg classes. Is there any way to identify these keys in ChucK?

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confused about time/control
by Peter Lutek 23 Oct '14

23 Oct '14

greetings! a little help for a newbie?.... when i run this bit of code, i would have expected the while loop to run for only 5 seconds, printing out a new value for "beat" whenever new data comes in from MIDI. then, it should print "done". instead, it just keeps printing the new "beat" values for as long as i let it run, never getting to the "done" line. i don't understand why the "while( now < later )" doesn't kill the loop after 5 seconds. also, xruns go through the roof and i have to kill it externally. i'm on linux, using jack. (all the setup of MIDI ports and variables happens before this, and i know it's functioning fine...) //////////// dur beat; now + 5::second => time later; while( now < later ){ while( min.recv(msgin) ){ ( msgin.data3 + 10 ) * 50::ms => beat; <<<beat>>>; } } <<<"done">>>; /////////// thanks much, in advance... cheers! .pltk. -- Peter Lutek improvising musician in Toronto, Canada http://peterlutek.com

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Static attributes and instantiation
by Gonzalo 23 Oct '14

23 Oct '14

Hi, This is weird behavior I think: -------------------- public class Foo { 1 => static int bar; } <<< Foo.bar >>>; // prints 0! Why? Foo f; <<< Foo.bar >>>; // prints 1, ok 2 => Foo.bar; <<< Foo.bar >>>; // prints 2, ok Foo f2; <<< Foo.bar >>>; // prints 1 again! -------------------- So it seems that static members get initialized only on instantiation, but to make it funky, on every instantiation... Is this a buggy implementation of static members, or am I missing something? Not complaining, just a question. :) Thanks! Gonzalo

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Calling parent methods
by Gonzalo 22 Oct '14

22 Oct '14

Hi, I'm pretty sure the answer is no, but here we go: is there a way to call the parent's method from a class? Something like: class Child { fun void init() { super.init(); // now do more stuff } } Thanks! Gonzalo

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Two classes referencing each other
by Gonzalo 18 Oct '14

18 Oct '14

Is this possible? If class A uses class B somewhere, and viceversa, how can I load them both from a third file? Cheers, Gonzalo

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Casting behaviour
by Gonzalo 17 Oct '14

17 Oct '14

I have this (unexpected?) behaviour when casting. I can cast a object to its parent class, but the methods that get executed are still their own (and viceversa). I.e.: ---------------------------------- public class Parent { fun void test() { <<< "Parent" >>>; } } class Child extends Parent { fun void test() { <<< "Child" >>>; } } Parent p; Child @ ch; p $ Child @=> ch; ch.test(); // prints Parent Child ch2; ch2 $ Parent @=> p; p.test(); // prints Child ---------------------------------- Is this intended behavior? What's the point of casting then? I might describe too what I'm trying to do, maybe there's a better approach. I have a .create method in Parent that returns a Parent object, and I wanted to create that same method in Child, but I can't do it because the arguments are the same, and it won't let me overwrite the method when only the return type changes. So to create a child with the .create method, I do this: Parent.create(...) $ Child @=> Child ch; Which works, but then it still behaves as a parent, so it defeats the whole purpose. Thoughts? Gonzalo

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replace multiple shreds simultaneously
by Peter Lutek 17 Oct '14

17 Oct '14

greetings! it seems there's no command-line option for simultaneously replacing multiple shreds, right? i.e. something like this isn't implemented: chuck = 1 firstreplacement.ck 2 secondreplacement.ck did i miss something? if it's not possible, what are some good workarounds? (on linux, with JACK) i guess there's this: chuck = 1 firstreplacement.ck & chuck = 2 secondreplacement.ck ...but that's probably not sample-accurate and has a bunch of extra keystrokes! :) thanks much... cheers! .pltk. -- Peter Lutek improvising musician in Toronto, Canada http://peterlutek.com

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Miniaudicle not showing Preferences menu
by wolfgang gil 13 Oct '14

13 Oct '14

And getting the following message out the console window (on a mac osx 10.6.8) [chuck]: system error: (CoreAudio unknown error) getting sample rate info... It happened suddenly. Not sure to what triggered it... I upgraded the miniaudicle on my computer but the problem persisted. Help? Please? Thanks in advance -- Wolfgang Gil IT Specialist, Sound Research Group coordinator EYEBEAM 34 35th Street, Unit 26 Brooklyn, NY 11232 m. 1-954-415-3613 wolfgang(a)eyebeam.org www.eyebeam.org www.wolfganggil.com Contour Editions - Installation Curator/Software Developer http://contoureditions.com/pages/about.html

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questions about the Bowed UGen
by Daniel Chapiro 12 Oct '14

12 Oct '14

Hi - I am using the Bowed UGen, and after reading the docs, trying to hear what's going on, and looking at Chuck's src, I still have some questions: (1) rate: Chuck complains that the rate method is not valid for Bowed. However, it's mentioned in some docs, and the source code has an ADSR inside, whose rate is set by noteOn/Off (but not by start/stopBowing). Also, this ADSR has reasonable decay and sustain values, but they are fixed. Is there any way to at least set the rate from Chuck code? (2) volume: it is a multiplicative factor, completely independently of whatever amplitude one sets with start/stopBowing set, right? (3) start/stopBowing: does the model have a transient, during which the string is vibrating with a different spectrum than in steady state? If not, to control the attack/decay, should I leave it bowing constantly, and control the attack/decay by adding an ADSR after Bowed, which would "gate" the sound? (4) in STK there's an asymptotic decay - is there anything like that in Chuck? (sometimes one may want a dampened, quick stop, but others one may want to let the string decay asymptotically, just as with plucked strings, regardless of having enertgized the string with a bow). Thanks! Daniel

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