June 2010 - chuck-users - lists.cs.princeton.edu

Scale & diatonic
by Hans Aberg 12 Oct '11

12 Oct '11

I have made a program, scale.ck, that admits one to work with scales, including tuning stretch, céleste tremulant, retune them, and then save to a file, with a line of code that can be pasted back into the source, available at next program startup. Scale tunings can be put into tuning banks, and otherwise defined by your favorite method. Details in the file. I have also updated my program for diatonic tuning systems, diatonic.ck. Just a few changes: adding some common tunings, fixing typos. The files are available here: http://www.math.su.se/~haberg/tuning_systems/ Hans

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Timing Issue
by Timothy Leonido 29 Jun '10

29 Jun '10

Hello, I have to preface this by saying that I may be missing an obvious answer, but what object will allow me to wait for an amount of time before a shred is active? Usually I set the gain to zero (on the otf 7 patch) for a few phrases and that works fine: after a minute, I can have a snare drum come in for a chorus. Though I'm afraid that there's a more logical way to do this... Thanks

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For Dan
by Kassen 18 Jun '10

18 Jun '10

Fellow ChucKists, Yesterday I wanted to wish Dan a happy birthday on FaceBook, hoping for many more years of fun with strings and code but thought it'd be nicer to write this in ChucK. Then stuff happened and I was too late. Belated but no less sincere; emulating strings in LiSa... because we can, and because LiSa can (LiSa can actually do anything, she's just modest). We start out with a very literal implementation of Karplus-Strong at concert A4 tuning. Then we start mucking with various parameters in ways that are less traditionally Karplus-Strong for some more interesting tembral effects. Yours, Kas. /* Do copy, do share. No warranties, no refunds. Physical models can (and will!) blow up; please mind your speakers, neighbours and pets. Remixing and sharing results strongly encouraged (many parameters left....). Happy belated birthday to Dan! */ //the patch (noise or a saw plus a envelope could emulate a bow instead of a pluck) Impulse i => LiSa l => dac; //needs to be defined second => l.duration; //two voices for averaging 2 => l.maxVoices; //buffer duration = source of the pitch second / 440 => dur base_cycle; //create a looping delay //looping for both recording and playback is on by default base_cycle => l.loopEndRec; l.loopEnd (0, base_cycle); l.loopEnd (1, base_cycle); 1 => l.record; //offset the second voice by one sample //so we average between the current and the last sample value l.play (0, 1); l.playPos (1, -1 * samp); //"::" should work here but gives me a error? [BUG] l.play( 1, 1); //average between the two values. ratio sets the "filter's" effect. //make sure the two add up to unity (1.0). l.voiceGain (0, .5); l.voiceGain (1, .5); //feedback sets the tone's decay .995 => l.feedback; //off we go! 1 => i.next; 2::second => now; //tradition ends here. //fun starts l.loopEnd (1, base_cycle * .5); 1 => i.next; 2::second => now; l.loopEnd (1, base_cycle * 2); 1 => i.next; 2::second => now; l.loopEnd (1, base_cycle * .333333); 1 => i.next; 2::second => now; l.loopEnd (1, base_cycle * 1.5); 1 => i.next; 2::second => now; l.loopEndRec() * 2 => l.loopEndRec; l.loopEnd (1, base_cycle - samp); 1 => i.next; 4::second => now;

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Latency measurement for ChucK
by Yonghao Wang 18 Jun '10

18 Jun '10

Hello All, I am new to ChucK but I've found it is very interesting and intuitive tool! I am interested in Latency issues of audio host. I've measured latencies on various hosts on standard Mac hardware (with on-board Intel HDA standard soundcard) with WindowsXP/MacOSx/Linux etc. So far linux has lowest overhead processing latency and also consistent as good as Mac or even better. I've tested ChucK on Mac OSX. The code I used is standard ADC one (http://chuck.cs.princeton.edu/doc/examples/basic/adc.ck) Buffer setting -> measured latency 16 samples -> 5ms 256 samples -> 20ms 512 samples -> 37ms In the console log messages, it always says: number of buffers 8. At sampling frequency of 44100Hz, so in theory: latency = (1/fs)*buffersize*8 16 samples -> 2.9 ms 256 samples -> 46.4 ms 512 samples -> 92.9 ms These two group of data doesn't seem consistent. I guess the buffer structure in ChucK is quite different with other audio hosts (normally they have both input buffer and output buffer). I am not quite understand the maths, can anyone give me some clue? How are the 8 buffers in ChucK arranged? I guess some buffers are in parallel otherwise the theoretical values wont be greater then measured values? I will try to test it on Linux/Jack soon that may be more consistent in terms of latency. Many thanks Y.Wang

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code reusability
by Thomas Girod 16 Jun '10

16 Jun '10

Hi there. I'm currently working on a chuck project that is progressively increasing in size. Some parts of this project are already quite generic, and I will probably use them in other projects later (namely, an interface to communicate with the novation's monome ripoff). So I start to wonder: how can I organize my code for easy reuse ? What are the options / good practices to write less monolithic chuck code ? Is it possible to write something that could behave as a library ? Thanks for your attention Tom

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launchpad class + mlr clone
by Thomas Girod 12 Jun '10

12 Jun '10

Hi fellow chuckers. this is my first contribution to the community - Hopefully some of you will find it useful / fun. http://github.com/jiyunatori/chuck launchpad.ck defines a class to interact with the Novation Launchpad controller. Right now it is far from complete, but the most important stuff is working: listening to press/release events, and controlling the LEDs. mluck.ck is a very basic clone of the excellent mlr app for the monome (http://docs.monome.org/doku.php?id=app:mlr), adapted to the launchpad. What it is doing: - play 8 pre-recorded loops in parallel (one per line) - jump around each loop with the main grid buttons - play/stop each loop with the scene buttons Feedbacks are welcomed ! enjoy Tom

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sharing code
by Thomas Girod 12 Jun '10

12 Jun '10

Hi there. I would like to share some code I wrote with the community, so I turned to the wiki. but apparently, the registrations are restricted right now. Is it possible to have an account ? Is there another place where I should drop my code ? tom

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Re: [chuck-users] chuck-users Digest, Vol 58, Issue 20
by jkZh 04 Jun '10

04 Jun '10

are there any illustration of installation or use this language to find at your web site? I visit the web site, but can't access to mov file with media player.

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Running chuck
by Tom Aizenberg 02 Jun '10

02 Jun '10

Hi all, When I run ChucK from the console ChucK sometimes stops when the console doesn't have focus. Has anybody got an idea how to fix this? Thanks, Tom

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input | chuck <read_stdin_and_do_stuff>
by v4hn 02 Jun '10

02 Jun '10

good ev'ning everyone, some time ago I showed ChucK to my girlfriend and she has been quite enthusiastic about it since then. So thanks for providing this interpreter! Well, right now she's coding a automatic composition tool(in python), which generates some (midi) numbers and prints them on the screen. Since this will be an any-time algorithm, the (actually quite simple) task for the audible back-end - which (she insists) should be written in ChucK - is to read the numbers from standard input and generate matching sounds. So the use-case would look like this: > ./compose | chuck play_composition.ck RTFM and RTFS got me to ConsoleInput and FileIO with the second not being able to connect to stdin. At the moment the only - quite hacked - way (AFAICS) to read /anything/ from stdin looks like this: <<< ConsoleInput in; while(true){ in.prompt(); line= in.getLine(); ... } >>> This doesn't realize EOFs, but keeps waiting, does it? And since FileIO provides a readInt() function, it would be nice to use it in this case... Is there a way, to read from stdin through some IO-Interface of ChucK or anything else 'official' - aka not stating in the source that it's just something hacked? If not, are there any ideas on implementing this in Version 1.2.1.4 ? Well, that's for now, regards, v4hn

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