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

Music Hack Day coming to New York
by Jordan Orelli 13 Jan '11

13 Jan '11

there's an audio-related hackathon coming up in NYC. 16 spots left. I'll definitely be in attendance. It'd be cool if there was some ChucK presence there :-D http://nyc.musichackday.org/

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Using Fourier Transform
by Lucas Zawacki 11 Jan '11

11 Jan '11

Sup guys. This is not much of a ChucK question but here goes... I have some free time now to experiment with ChucK and I dug up some old emails from the list. There's one talking about analysing the frequency of a given signal and the short answer was to use the FFT. I decided I would try this aproach in order to receive input from my guitar, match the frequency being played and then issue a MIDI event to another synthesizing app. The problem is that I have a very abstract understanding of the FFT (I've used it before to do simple image processing). It does makes sense to me, e.g I can visualize in my mind what the FFT of a simple sound wave would look like, but I wasn't competent enough to extract the absolute pitch data that I wanted. Anyway can someone elaborate a little more on the topic of frequency analisys or maybe point me to a good tutorial? I think I'll start with the wikipedia article on the Fourier Transform and see where it gets me... -- http://www.twitter.com/lfzawacki http://www.linesocode.wordpress.com

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TweecKs
by Spencer Salazar 07 Jan '11

07 Jan '11

Hello everyone! Inspired by a forum thread[1], a Stanford CCRMA homework assignment[2], and something similar I heard about in the SuperCollider world, I have created a community-driven Twitter account for the express purpose of broadcasting meaningful, self-contained ChucK programs that fit into a single tweet. The programs tweeted from this account will be based on submissions from folks like yourselves. I will be acting in a limited curatorial role due to the nature of this sort of thing, but the goal is really to get as many interesting programs from as many people as possible. Without further ado: http://twitter.com/TweecKs To submit your program, simply tweet it to @TweecKs. You can also send me an email: spencer at ccrma.stanford.edu. If you send me an email, please make sure your program is 140 characters or less, including a block comment with a credit (if desired). There aren't any guidelines as far as quality; as long as it runs, makes sound, and doesn't do anything apparently malicious to people's computers, its good! And, if you are a Twitter user, do consider following @TweecKs, to stay up-to-date on the latest in concise audio programming! [1] http://electro-music.com/forum/viewtopic.php?t=13512 [2] https://ccrma.stanford.edu/wiki/220b-winter-2011/hw0#Specification_.28part_…

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chuck in a safe box?
by Zed A. Shaw 06 Jan '11

06 Jan '11

Hi, I'm toying with a small idea to let people upload bits of chuck code to a website and then have it play out to the world. I haven't started coding anything yet, but I was wondering how hard it is to put ChucK into a safe environment so that it can't touch the OS? In Lua I'd do that by ripping out the various OS features. Is there a similar thing with Chuck? -- Zed A. Shaw http://zedshaw.com/

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chuck posibilities at sample level
by ronni montoya 04 Jan '11

04 Jan '11

Hi, im new in this list, i was using supercollider before, somebody told me about something about the posibilities of chuck for making sample level operations. Can anybody explain me about this? Do you think chuck has new posibilities related to sample level synthesis? that cannot been done with sc3? can anybody explain this further? thanks in advance R.

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chuck for live coding
by ronni montoya 04 Jan '11

04 Jan '11

Hi everybody ,im new with chuck ive downloaded chuck and i was playing with it. I was wondering is it possible to run a command directly in the shell instead of saving the code in a .ck file and execute it ? are there any tutorial or examples of chuck for live coding out there? thanks R.

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Selecting Driver
by Tom Aizenberg 01 Jan '11

01 Jan '11

Hi all, Is it possible to select which driver for the soundcard I want to use? Like in Reason or Logic you can select the ASIO driver and change the buffersize... Any help would be appreciated! Greetings, Tom

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newbie envelope follower question
by daniel gomez 22 Dec '10

22 Dec '10

Hi guys(sorry that i sent this same email to the chuck list and not the chuck-users)Im just getting started this week in chuck. Been reading the documentation and following the examples, but im stuck with trying to start an envelope that contours the filter frequency just when i hit any key. I have this patch (below) that (supposedly) contours the filter and the oscilator at the same time, but i dont get what is wrong cause it is not working. It seems as if the envelope is sliding but it is not being updated when the amplitude envelope is on. Im sorry if this is too obvious but have not found a way to do it. ThanksHid entrada; HidMsg mensaje;0 => int device; if( !entrada.openKeyboard( device ) ) me.exit();//El patchSawOsc o1 => LPF f=> Envelope e1 => dac;Step stp => Envelope e => blackhole;1 => stp.next;400 => e.value;800 => e.target;2 => e.time;o1.gain (.2);0.020 => e1.time;o1.freq(200);while (true){entrada => now;e.last()+200=> o1.freq;e.last()+200=> f.freq;while( entrada.recv( mensaje ) ) //cuando 'entrada' reciba un 'mensaje'{if( mensaje.isButtonDown() ){1=>e1.keyOn; 1=>e.keyOn;}if(mensaje.isButtonUp()){0=> e.keyOn;0 => e1.keyOn; }}}

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Circular references in class definitions
by Jordan Orelli 08 Dec '10

08 Dec '10

in short: Is there any way to have two separate classes that reference one another in their definitions? I want objects of type A to encapsulate a collection of objects of type B, but for objects of type B to also be able to hold a reference to their containing object. Alternatively, I could use an event system where the child objects (class B) raise an event that the containing object (class A) listens to. I'm not entirely familiar with ChucK's event model yet, though. Here's the full story of the problem: I'm currently working on an instrument for the Novation Launchpad using ChucK. The rest of my explanation assumes you have a basic familiarity of the layout and functionality of the Novation Launchpad. The way it's structured, I have one class called Launchpad that is responsible for all data and functionality common to an individual device. It contains a collection of 8 LPIs (Launchpad Instruments). At any given time, one LPI on the device is in focus; interaction with the main grid and rightmost column controls that LPI. The topmost row selects between the 8 LPIs. The Launchpad object's main jobs are to allow the user to switch focus between LPIs, and to observe MidiIn messages from the physical device. So the Launchpad class handles and routes incoming data. The LPIs are the actual synthesizers; they manage (most) outgoing data. The problem I'm faced with is that the individual LPIs don't have a reference to the Launchpad itself, so I'm having trouble tracking the state of the MIDI lights in ChucK. This is needed to reduce the number of MIDI messages that I send to the device; ultimately I want to prevent any MIDI message that would tell the device to turn off a light that's already off. These messages have been creating a bottleneck, and under certain circumstances introduce unacceptable delay. You can view the source, and if you have a Launchpad check it out and play with it here: https://github.com/jordanorelli/chuckpad -Jordan (this is my first Github project, so please let me know if I have it configured wrong and you can't actually checkout the project; it's intended to be public)

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Chuck Dynamic Linking?
by mike clemow 08 Dec '10

08 Dec '10

Dear Dev'rs: >From the documentation here: http://chuck.cs.princeton.edu/doc/program/stdlib.html "ChucK Standard Libraries API these libraries are provide by default with ChucK - ****new ones can also be imported with ChucK dynamic linking (soon to be documented...).***" (emphasis mine) Does "soon to be documented" mean that the functionality already exists in the current version or in CVS or at all? And the obvious follow up: If it's in the current version or CVS, can we have a hint? Is there a secret Chuck pre-processor? Cheers, Mike -- http://michaelclemow.com http://semiotech.org

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