May 2007 - chuck-users - lists.cs.princeton.edu

stk questions - SawOsc and filters
by Josh Lawrence 31 May '07

31 May '07

Last night I sat down and was able to modify polyfony.ck to use a SawOsc instead of the Mandolin. My next step was to try to connect that oscillator to a filter, but how do I do that? My thinking was after I get done with defining my SawOsc parameters, I could just chuck the oscillator to the filter, like so? s => moog; (s is my SawOsc, and moog is Moog.) However this didn't work so well. When I did it, the osc stopped tracking note/frequency, and just played a single note all over the keyboard. Does anyone have any examples of a more complete subtractive synthesizer that I can model mine after? Final question: Is monophonic operation with glide out of the question with ChucK? Thanks, -- Josh Lawrence http://www.hardbop200.com http://www.joshlawrencetrio.com

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"playing" chuck
by Josh Lawrence 30 May '07

30 May '07

hello all, while I'm not new to music or linux, I am brand-spanking new to chuck and, probably more importantly, the whole livecoding idea. that being said, here are my questions: I'm looking for what I'm calling a "text synth", that is a synthesizer that runs completely independent of any gui and can be played from my midi keyboard. I really like what chuck can do, but I can't figure out if it is capable of being played from a keyboard (midi). basically I'm looking for something to use as a "whole machine" - I can kick off a predetermined beat, kick off a bassline, load up a synth patch, play it, etc. I can see from the doc that chuck can do the first two pretty easily, but what about the third? -- Josh Lawrence http://www.hardbop200.com http://www.joshlawrencetrio.com

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hid related "illegal operation"
by Kassen 30 May '07

30 May '07

Dear ChucKists, A possible HID issue... Since a while I'm using a new (for me) PS2 => USB converter for my game devices, it's by a brand called "EMS" and it has some advantages over other ones like being able to accomodate two devices on one USB connector, it has support for dancepads (meaning you can push left&right at the same time, something that some other converters tend to crash on) and it can map buttons to keyboard keys. Overall that means it's good and usefull, it was recomended by some sites about those dance games and those sites are quite demanding on converters since both timing and this dancepad-issue are very important to them. However, it also has "modes" called "compattible" and "normal". I'm not at all sure right now what those do exactly (sparse English documentation by Asian manifacturers...). Here comes the problem; ChucK will crash outright upon initiating the device if those aren't set exactly right. Hence, in my interpertation of the situation, there is something, somewhere, in our HID device amis. It would be fine with me for ChucK to complain about bad settings but simply crashing completely with no notification seems wrong. Clearly; "it sometimes crashes" isn't enough, so; should I find and send more data and if so what? Spencer? Also; has anybody tried hooking up a PS3 "Sixaxis" to ChucK on Windows with working motion sensing? That one looks nice for modulations and rocking the Shakers but I'd like to know it'll work because that's the only thing I'd use a Sixaxis for right now since so far nothing else about the PS3 tickles by fancy to the tune of 600 bucks. Cheers, Kas.

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Mini Audicle doesn't write to disk until it closes properly?
by mike clemow 25 May '07

25 May '07

Hi All, So, I was hacking away in MiniAudicle and doing ctrl-s every line of code so that I didn't lose my work (I have a tendency to crash Mini, chuck, jack or some combination thereof) but I lost all my work when I crashed MiniAudicle anyway. Does MiniAudicle not write to disk until it closes properly? I can recreate this by creating a new file, typing some code, saving it as test.ck, and then closing MiniAudicle rudely by doing ctrl-c on the terminal, after which test.ck is nowhere to be found. Anyone else having this problem? Cheers, Clembie

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chuck build for 64bit linux
by Bob Huebert 25 May '07

25 May '07

I've seen that others are having this issue as well and am curious on the status. We are kind of dead in the water with using chuck on our newer systems (dual singlecore opterons, SUN Ultra40s) and have had to relocate chuck service to winders box. We'd really, really, really, like to go back to the linux platform. We love chuck. We'd love chuck even more if it was 64bit compliant. Thanks in advance to all for guidance on this issue. -bob ________________________________________________________________________ Bob Huebert email: huebert(a)arsc.edu Visualization Systems Analyst voice: (907) 450-8638 Arctic Region Supercomputing Center FAX: (907) 450-8601 University of Alaska Fairbanks WWW: http://www.arsc.edu/

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mini Audicle crashes when removing shreds
by Leuthold Dominik 24 May '07

24 May '07

hi guys i continuously encounter crashes with the new version of mini Audicle. it happens when i try to remove a shred from the virtual machine, when the corresponding shred is already closed. (removing by clicking on the "-" sign in the vm form). steps to reproduce: 1: open the otf_01.ck from the examples and add it to the vm 2: close the shred window of otf_01.ck 3: remove the shred by clicking ont the "-" in the vm 3: peng! aargh.. this drives me crazy :-P unfortunately i encounter this error every 10 minutes cause i'm livecoding with a lot of shreds the same time. sorry to say, but i need to go back and use the older version - too risky for my health ;-) cheers /moudi

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ResonZ default freq
by Kassen 22 May '07

22 May '07

Hi list! A very minor point, but.... Is it correct behaviour that ResonZ defailts to a freq of 0Hz and so doesn't pass anything without setting the .freq parameter? I think I'd prefer 440Hz or middle C. Kas.

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Vienna University ChucK?
by Kassen 16 May '07

16 May '07

Hi, Would there perchance be somebody here teaching ChucK at the Technical University of Vienna? If so then there is one of your students on our little forum (that I moderate) who believes it's nesicary to do granular pitch-shifting without LiSa. Clearly possible but much harder and more complicated and not so accessible to fresh users. Is that realy what should be done? I'm a bit torn between helping a friendly new user and ruining the dificulty level of homework. see here; http://electro-music.com/forum/viewtopic.php?t=14196 (halfway down the discussion) Sorry to everybody else, I'm sure the Technical University of Vienna is great institute but the website isn't so clear to me, otherwise I would've gone around the list. Cheers, Kas.

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Lisa, voice-gain convolution, etc.
by Kassen 16 May '07

16 May '07

Hi Dan, Hi list! I was thinking about a little ChucK convolution patch, kind of as a excersise, kind of as a joke. Basically I was thinking about taking a array of SndBuf's (as many as there are samples in the impulse responce and all holding the same impulse responce) and firering them off in turn each samp with a gain determined the .last() of the input sound. Simple, fun and probably a bad idea on any practical level since excelent free convolution reverbs are around already. Then I thought of LiSa... LiSa is already a lot like a array of identical buf's so this might even make a bit of sense. Sadly it turns out that LiSa lacks something like this; mylisa.voicegain( voice, float) The more I think about that, the more it makes sense as a practical addition, not just for convolution. For example this might be mapped to velocity for some cheap & cheerfull soft-sampler and per-grain variable volume is usefull in grain-clouds as well. Could this perhaps be considdered for a future update? Cheers, Kas.

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De-Lurk and showing some stuff I've written the last few days
by Loscha 11 May '07

11 May '07

Hello All. My name is Edward. I'm a synthesis buff from Melbourne. I've been using Chuck for about a week now, and I'm really loving it. I haven't really learnt to use a sporking language before. I used to program in Borland Turbo C 2.0 back in the early 90s, and also did a lot of QuickBasic, but, I never really caught up to the modern age so to speak. I'm only 29, so I thought, there's no time to learn like now! I think I've got this all sporked off in a reasonably sensible way, but, I could probably do more. I am totally open to people sending me suggestions (on or off list). I'm not "precious" about my program in any way. I hope some of you get some use from this example. I don't think it is by any means "distro example" quality, but, I hope that with some work, and the addition of some more features not present in examples currently in distro, that one day it might be! I have tried looking around for a model for sympathetic strings, and have had no luck. If anyone has any advice, please advise. best wishes to all; -Edward r Jones // Tambura-with-sporking.ck // // Tambura with Sporking // // by Edward r Jones (loscha(a)gmail.com) // // This is my emulation of an electronic tambura device. // By Tambura, I mean the Indian classical instrument. // A Tambura has 4 to 6 strings, which are plucked in a repeating pattern to accompany Indian classical music // It has a resonating cavity, and resonant sympathetic strings, like a Sitar, but, no frets. // Please Help! This Model Needs! // // = Sympathetic Strings. I've tried setting up a series of 8 delay lines // tuned to the resonant frequencies I desire), but, they didn't give me the results I wanted at all. // I am new to coding Physical Modelling, and if anyone has some advice on this matter I'd love to hear from you. // // A Resonant Cavity. // I've goen with using LPF and HPF to limit the output frequency range to give the sort of timbre I want, but, // I know that this could be better acheived. // // At the moment, it sounds more like a Koto. // I found the stk Sitar instrument to sound nothing like a Sitar or a Tambura, // Buuut, this is because of the reasons I listed above -- Sympathetic Strings & real Resonant Cavity. // // In closing, I want to thank: // The ChucK community, I love this language (and you all!) so much, // and I hope to be able to contribute to it's development in the future // My wonderful partner, Michelle, who doesn't mind me staying up until 3am working on this stuff! // All my local friends in synthesis; Bill Harrison aka James Earthenware, Paul Perry, Robin Whittle & Jaymz // \=> Clae, All the Melbourne Dorkbot community, and all the other hardcore synthesists in Melbourne, Victoria, Australia! // All my online friends, Matrixsynth, Sealed, SynthDiy and all my LiveJournal Buddies. // The Founding Fathers of this craft that I love so much. John Chowning, Max V Matthews, Steve Reich, Paul Lansky & Stockhausen, // // Enuff! On to the Code! [ 1, 0, 0, 1, 1, 0] @=> int beats[]; // 1 means play, 0 means skip [ 00, 00, 00, 12, 09, 04] @=> int notes[]; // Note pitch, relative to noteoffset 30 => int noteoffset; // this is the transpose, to make scales easier float variance[beats.cap()]; // this is for randomization of string pitches to achieve "thickness" // They are calculated once at startup, to simulate real string tuning .05 => float waver; // range for variance in NOTES 72 => float tempo; float click; 30000 / tempo => click; <<<"Click length", click,"">>>; int numsteps; beats.cap() => numsteps; LPF lpf; HPF hpf; JCRev jcrev; 2550 => lpf.freq; 300 => hpf.freq; .05 => jcrev.mix; StifKarp tambura[numsteps]; lpf => hpf => jcrev => dac; //------- Hook up all tamburas to the chain & set them up the way we want them. // .pickupPosition - ( float , READ/WRITE ) - pickup position [ 0.0 - 1.0] // .sustain - ( float , READ/WRITE ) - string sustain [0.0 - 1.0] // .stretch - ( float , READ/WRITE ) - string stretch [0.0 - 1.0] // .pluck - ( float , WRITE only ) - pluck string [0.0 - 1.0] // .baseLoopGain - ( float , READ/WRITE ) - ?? [0.0 - 1.0] // .clear - ( ) - reset instrument for (0 => int stab; stab < numsteps; stab++) { tambura[stab] => lpf; .03 => tambura[stab].pickupPosition; 1 => tambura[stab].sustain; 1 => tambura[stab].stretch; .99 => tambura[stab].baseLoopGain; Std.rand2f(1-waver, waver) => variance[stab]; <<<"tambura #",stab,"hooked up","">>>; } //------ Hookups done. <<<"pre-comparison","">>>; if (beats.cap() == notes.cap()) { <<<"Steps in our sequence", numsteps,"">>>; //------------------------------------ The Sequence Plays! ---------------------- while (true) { for (0 => int stab; stab < numsteps; stab++) { if (beats[stab] == 1) { <<<"Stab",stab,"">>>; tampluck (stab); } click * 1::ms => now; } } //------------------------------------ The Sequence (never) Ends! ---------------------- <<<"End of Playing!","">>>; } //------------------------------------------------------------------------ // Error, stop the program else { <<<"ERROR IN SEQUENCER DATA", "";>>>; <<<"Item count mismatch","">>>; } //------------------------------------------------------------------------- // This is the sporkage for our note playing. fun void tampluck (int step) { float npitch; variance[step] + noteoffset + notes[step] => Std.mtof => npitch; npitch => tambura[step].freq; <<<"Pitch",npitch,"">>>; 1 => tambura[step].pluck; } -- www.loscha.com/chuck

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