October 2004 - chuck - lists.cs.princeton.edu

shreduler skew : critical patch
by Ge Wang 17 Oct '04

17 Oct '04

Dear All, We have discovered and fixed a shreduling issue where accumulated rounding errors caused timing skew depending on the duration used to advanced time. It is noticeable in tightly timed shreds (like otf_*.ck) after a few minutes. This problem has been fixed. chuck-1.1.5.2 is identical to the earlier release today except for this fix. This is what Micro$oft might call a "critical update". http://chuck.cs.princeton.edu/ If you get this update, fire up otf_*.ck : the easiest way (using Perry's one shell manuever): > chuck --loop & > chuck + otf_01.ck ... > chuck + otf_02.ck ... If it still sounds OK (the shreds don't phase) after a few minutes, then the problem is gone. Best, Ge! ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.

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upcoming: (live) disaster week
by Ge Wang 11 Oct '04

11 Oct '04

Dear All, Upcoming events in the New York City / Princeton area, very soon: (Somehow, they all end up in span of 7 days) If anyone is within chucking distance, please come on down. insanity starts with: --- October 12th, Tuesday, 9:30pm Princeton Terrace Club Perry + Ge ChucK double projection duet at ffmup (same place Nick and Fredrik set fire to (figuratively/musically) recently) http://ffmup.org/ (free admission) --- October 13th, Wednesday ACM Multimedia 2004, New York, NY ChucK presentation and live demonstration as winner of 2004 ACM Multimedia Open Source Software Competition http://www.acm.org/sigs/sigmm/mm2004/ http://www.acm.org/sigs/sigmm/mm2004/acm_mm04_FinalProgram.htm (need conference registration) --- October 17th, Sunday 5:00pm Share, New York NY ChucK Workshop + Performance Ge + Phil http://share.dj/ http://chuck.cs.princeton.edu/events/share-2004.10.17.html (see above for direction, free admission) --- October 18th, Monday noon Princeton Computer Science Graphics Lunch, Princeton Audicle Presentation http://www.cs.princeton.edu/gfx/lunch.php (there is a good reason to come to this - there is free food) --- Best, Ge!

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Langage syntax
by Laurent Ostiz 05 Oct '04

05 Oct '04

Hi ! Is there any document available with the Chuck langage syntax (conditions, loops, etc.), reserved words, meanings of => in differents contexts, because sometimes I see things in papers or exemples which are not described in the actual documentation. Another great thing would be, describing the libraries, to indicate with the range of parameters to what they correspond (frequency, cents, midi amplitude, dB amplitude, mV amplitude, or whatever else). Thanks

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Some chuck questions.
by Jim Bumgardner 03 Oct '04

03 Oct '04

Hi Ge, I'm liking ChucK a lot thus far! These are FAQy kind of questions. You've probably seen them before. 1. There are a number of instruments described in the docs that I would like to play with, but that don't appear to be implemented yet (at least, not in the windows version). These include ModalBar, Sitar & StifKarp. Is there a definitive 'working' instrument list somewhere? Are the remainer going to be added any time soon? 3. I'm doing a lot of fancy-schmancy algorithmic score generation these days (using Python and/or KeyKit). Arrays are very helpful for accomplishing this (for scoring lists of phrases, chords, etc.). For example, I've implemented a version of Terry Riley's "In C" in KeyKit. I think it would make a nice demo to implement a single player of "In C" in ChucK (this player could then be run multiple times as different shreds, to create an ensemble). However, it's really helpful to be able to store the 53 seed phrases in arrays. A search of the examples shows no square brackets. From this can I assume there are no arrays? Are arrays coming? If not, is there a paradigmic ChucKish way of accomplishing this? - Jim Bumgardner

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Sync question
by Laurent Ostiz 02 Oct '04

02 Oct '04

Hi ! I try to get into chuck for 2 or 3 days. I have a simple question : when you write something like : phasor p => triosc t => dac; 40 => p.freq; 2 => t.sync ... I understand that triosc is sync to phasor. But what is in sync in triosc ? Frequency, amplitude, phase, etc. I did not see any precise information about this. Or did not really understand the => meaning.... Thanks Laurent

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recording your session to file
by Ge Wang 02 Oct '04

02 Oct '04

It's me again (sorry). Here is a brief tutorial on writing to disk... --- 1. recording your ChucK session to file is easy! example: you want to record the following: > chuck foo.ck bar.ck all you's got to do is ChucK a shred that writes to file: > chuck foo.ck bar.ck rec.ck no changes to existing files are necessary. an example rec.ck can be found in examples/, this guy/gal writes to "foo.wav". edit the file to change. if you don't want to worry about overwriting the same file everytime, you can: > chuck foo.ck bar.ck rec2.ck rec2.ck will generate a file name using the current time. You can change the prefix of the filename by "data/session" => w.autoPrefix; w is the WvOut in the patch. Oh yeah, you can of course chuck the rec.ck on-the-fly... from terminal 1 > chuck --loop from terminal 2 > chuck + rec.ck --- 2. silent mode you can write directly to disk without having real-time audio by using --silent or -s > chuck foo.ck bar.ck rec2.ck -s this will not synchronize to the audio card, and will generate samples as fast as it can. --- 3. start and stop you can start and stop the writing to file by: 1 => w.record; // start 0 => w.record; // stop as with all thing ChucKian, this can be done sample-synchronously. --- 4. another halting problem what if I have infinite time loop, and want to terminate the VM, will my file be written out correctly? the answer: Ctrl-C works just fine. ChucK STK module keeps track of open file handles and closes them even upon abnormal termination, like Ctrl-C. Actually for many, Ctrl-C is the natural way to end your ChucK session. At any rate, this is quite ghetto, but it works. As for seg-faults and other catastrophic events, like computer catching on fire from ChucK exploding, the file probably is toast. hmmmm, toast... --- 5. the silent sample sucker strikes again as in rec.ck, one patch to write to file is: dac => gain g => WvOut w => blackhole; the blackhole drives the WvOut, which in turns sucks samples from gain and then the dac. The WvOut can also be placed before the dac: noise n => WvOut w => dac; The WvOut writes to file, and also pass through the incoming samples. --- 6. post your files online http://chuck.cs.princeton.edu/wiki/ --- 7. I need to go to sleep. this concludes the brief tutorial. Best, Ge!

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version 1.1.5.0 released
by Ge Wang 02 Oct '04

02 Oct '04

Fellow ChucKers, chuck-1.1.5.0 is released! This is a minor release, numbered 1.1.5.0 because we ran out of single digits after 1.1.4.9. The next major release will be 1.2.0.0. That is coming in next few days. 1.1.5.0 contains bug fixes, improved sndbuf, and the ability to write out to audio files: http://chuck.cs.princeton.edu/ --- 1.1.5.0 - 2004.9.29 - now able to write audio files (wav, aiff, raw) (try rec.ck and rec2.ck concurrently with any other shreds to record to disk) - STK file endian is now observed (more things should work on little endian systems) - added 4 "special" built-in sound samples "special:glot_pop" - glottal pulse (formant-free) "special:glot_ahh" - glottal 'ahh' pop "special:glot_eee" - glottal 'eee' pop "special:glot_ooo" - glottal 'ooo' pop (see/listen to moe++.ck, larry++.ck, curly++.ck) - all bulit-in sound samples now loadable from both WaveLoop and sndbuf - (win32) sndbuf now properly loads wav aiff new examples: - moe++.ck - stooges, evolved - larry++.ck - curly++.ck - rec.ck - run this concurrently to write audio to file (also try with -s flag for file out, no real-time audio) - rec2.ck - same as rec, but writes to different file every time, for sessions HappY ChucKing! Best, ChucK team

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Emacs major mode
by Mikael Johansson 01 Oct '04

01 Oct '04

Hey all. I managed to spend all day on ChucK; installing it, falling in love with it, playing around with it, and coding an Emacs Major Mode for working with it. It's the first mode I've ever done; if you see ways to improve it - please do. It's extremely windows-centric right now (visible in the path to the chuck executable in the code =), but easily adapted to other systems. -- Mikael Johansson To see the world in a grain of sand mikael(a)johanssons.org And heaven in a wild flower http://www.mikael.johanssons.org To hold infinity in the palm of your hand http://blog.mikael.johanssons.org And eternity for an hour

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