June 2011 - 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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avoiding lag
by Timothy Leonido 27 Jun '11

27 Jun '11

Hey All, Is there a way to ensure that two patches will synch properly? Sometimes the simultaneous chucking of two heavy patches will cause a lag: one will be set back .5::T behind the other. I tried machine add for this, but ran into the same problem. Thanks, as always, & nice weekend, Tim

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documentation: pdf totextplain and speech synthesizer
by tempjayren＠gmail.com 26 Jun '11

26 Jun '11

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 i have the pdf version of the chuck manual, very nice that, though because i'm using a speech synthesizer, the easier thing for me is to convert to text and to read that way, either that or old habits die hard, i haven't played with pdf and text access with speech lately, it might have gotten better since early 2000 when i toyed with it last. anyway, enough of that, i want to make the pdf manual text, however when i do so it doesn't appear to convert properly for some reason. it is hard to follow directions and learn from tutorials when the text isn't exactly what was intended. am curious if anyone else has encountered this or a solution for such. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJOButJAAoJEIaKvi7tbzRHPl8H/AtbTuUgc7cv3McTdjrg6U+c HkM9olDQ5TdFLTCcVBThg4xQ2Gd5vKaCRnea0rc5b4TQ2qLbOWlxdLvzSCGYxOBr SH+7QEUnfr6Q7Ko7dHpZDfXBP2bjK/dBw+MgKukIZ1uFN7D8WtUHH4uMDGeRFcxT bwU5lFadDP6rCrU1zPFu5iwXLM7Fc6x1QXXpA8ZdM5Vf4bUDll+JoVweVj/VtH4P 7KN3PCkV/ZzzjaeWcPhYNJfHPKgbMKOutKfsC/P/manoevi1XwltsnUKfVB1aE7u EUM9mHur7fBRwgyJ/m6SIV3a1vNYRs1/4BXjIStT6N2SWpJH+Z8E4Rl1w4oheso= =A6dJ -----END PGP SIGNATURE-----

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OT: Prague - Electronic Music, etc.
by mike clemow 20 Jun '11

20 Jun '11

Hey Chuckists, So, I find myself in Prague for work and I would love to see some electronic music / meet Chuck people / even get a gig (?) while I'm here. Any advice / ideas / contacts? I've been here for a week and a half, and I'm here until July 5th. If any of you will be in the Czech Republic, please holler. Best, Mike -- http://michaelclemow.com

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Virtual Audio World (VAW)
by Les Hall 17 Jun '11

17 Jun '11

I have decided to create a ChucK-based distributed virtual audio world. In this world we will have places which are physically located on each other's computers and virtually located throughout cyberspace. The first place in this world will be on my Mac mini. I have received permission to use five of the public streaming ports on radio.electro-music.com for this world temporarily. In the event that it grows, we will address the issue of expansion with electro-music server resources, however this world will not be restricted in any way other than morally, ethically, and legally as appropriate. This means that if you have streaming resources you may use them as well. The focal point for discussion of this virtual audio world will be a thread that I just started on the ChucK forum of electro-music.com. The thread is here: http://electro-music.com/forum/viewtopic.php?t=48042 Tonight I will set up a two-channel version of this world so that I and up to two guests can participate as soon as possible. It will use public ports public_1, public_2, and public_3, the latter two of which are for guests of my place in this world. I will post full information of the admittedly somewhat complex task of setting up for streaming into this world in the thread linked above. I openly invite your participation. Les (Inventor)

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sleep sort port
by Kassen 16 Jun '11

16 Jun '11

Fellow ChucKists, I just noticed this sorting algorithm; http://dis.4chan.org/read/prog/1295544154 (should be work-safe, despite that URL) for those afraid of 4chan links and for reference, here is it; #!/bin/bash function f() { sleep "$1" echo "$1" } while [ -n "$1" ] do f "$1" & shift done wait example usage: ./sleepsort.bash 5 3 6 3 6 3 1 4 7 Since this is time-based and also spectacularly impractical it should be of acute interest to present company. I therefore ported this to ChucK which was so far lacking a sorting algorithm that is consistent with our time-centric approach to programming. ----------------------8<------------------------------------- int input[8]; for (int n; n< input.size(); n++) Std.rand2(0, 20) => input[n]; int output[false]; fun void arrayPrinter( int arg[] ) { for (int n; n < arg.size(); n++) chout <= arg[n] <= " "; chout <= IO.newline(); } fun void waiter(int length) { length::second => now; output << length; } arrayPrinter(input); for (int n; n< input.size(); n++) spork~waiter(input[n]); while (output.size() < input.size()) second => now; arrayPrinter(output); ---------------------------------------------8<---------------------------------- This will display a list of random numbers, spends some time on sorting them, then displays the numbers again, but sorted. Hope that's good for a smile for some. Yours, Kas.

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Assigning tasks to keys
by Timothy Leonido 13 Jun '11

13 Jun '11

Hey All, In the theme of the "key organ" example patch, I'm wondering how to assign more varied tasks to my keyboard. Rather than give the keyboard a midi-type of access to scales, I'd like to have different keys control different aspects of loops, such as sample rate control (or if "r" could increase the reverb on a loop while it's in action). Please let me know if you have any advice on this one... Thanks! Tim

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Tracking down clicks and pops..
by Johnathan Bell 13 Jun '11

13 Jun '11

I'm working on a subtractive synthesis program written in ChucK, and I'm not sure, I may have sporked one too many threads, it may be that I'm just not resetting some parameter, but I'm getting some clicking noises in my latest program... I guess my first question is in general, what would cause a clicking or popping noise first of all... The synth is three square waves, slightly detuned and out of phase with each other, and there's a high-to-low LPF and HPF filter acting on the note as it attacks and decays, but it seems to only click *sometimes* and specifically when I hit a low note and then go up to a high note. If I disable filter sweeping entirely, it seems to get rid of some of the clicks, but not all of them. The program is based on the example "polyfony.ck" but it's quite a bit larger now (approx 700+ lines)... Some other notes of concern, each note handler thread (of which there are 20) sporks it's own threads to modulate some parameters, so being 20 note handlers + three threads per note handler + a few other threads (such as the midi watcher), I've got almost 90 threads running at one time, could that be part of the issue? - Johnathan

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New Thread: DSP in ChucK
by Perry Cook 11 Jun '11

11 Jun '11

Yo all, Based on discussions of DSP in ChucK, I thought I'd split it out into a new thread. The last time I taught my music DSP intro course (COS325 Transforming Reality Through Computer, named long ago by Paul Lansky and Ken Steiglitz when they taught it on NeXT Machines!!), I taught it in STK AND ChucK (with just a touch of MATLAB for completeness). Most all examples are provided in C, C++ (via STK), and ChucK. http://www.cs.princeton.edu/courses/archive/spr09/cos325/ Lately I've been doing a lot of intro ChucK lecturing (Cal Arts, ASU, etc.) and have been showing them how to do things in at least 3 ways: 1) Directly in the Language 2) Using built-in Unit Generators (example, building a flute from delay lines) 3) Using higher-level built-in Unit Generators (example, using the Flute UG) For example, a two-pole feedback filter can be done directly in the language, with arrays, and Step for output: // ***************************************** // Two Pole Resonator directly in ChucK Noise n => Gain input => blackhole; Step output => dac; [0.0, 0.0] @=> float outputs[]; [-1.977755, 0.998001] @=> float coeffs[]; 0.001 => input.gain; while (1) { input.last() - outputs[0]*coeffs[0] - outputs[1]*coeffs[1] => float temp; outputs[0] => outputs[1]; temp => outputs[0] => output.next; 1 :: samp => now; } // ***************************************** or with Delay unit generators (by the way, this is a way to do a UG based arbitrary order FIR/IIR filter): // ***************************************** // Two Pole Resonator using Delays Noise n => Gain output => dac; output => Gain d1 => output; // 1 sample delay output => Delay d2 => output; // 2 sample delay 1 :: samp => d2.delay; // feedback adds 1 sample of delay 1.977755 => d1.gain; -0.998001 => d2.gain; 0.001 => n.gain; while (1) { 1.0 :: second => now; } // ***************************************** Or, using the built-in TwoPole Unit Generator: // ***************************************** // Two Pole Resonator Unit Generator Noise n => TwoPole tp => dac; 1000.0 => tp.freq; 0.999 => tp.radius; 0.001 => tp.gain; while (1) { 1.0 :: second => now; } // *****************************************

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Fwd: programming of the art computer
by Kassen 11 Jun '11

11 Jun '11

Will likely be of interest to some? ---------- Forwarded message ---------- From: alex <alex(a)lurk.org> Date: 10 June 2011 13:36 Subject: [livecode] programming of the art computer To: livecode(a)toplap.org Hi all, Here's a new mailing list just starting up which might be of interest to some here, on designing programming languages for the arts: http://lists.lurk.org/mailman/listinfo/potac archive here: http://lists.lurk.org/pipermail/potac/ best wishes alex

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