February 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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Filters blowing up: any news?
by Tomasz Kaye's brain 25 May '10

25 May '10

At the end of November last year I posted to the list about a problem experiencing where chucks filters (lp, bpf etc) 'blow up' under certain conditions. Here's the archived post: https://lists.cs.princeton.edu/pipermail/chuck-users/2009-November/005045.h… I wondered if anyone has made any progress with finding a solution and/or figuring out exactly what was causing this. In a couple of months I'll be performing with a synthesis environment that I was part way through creating in ChucK before I ran into the filter bug. I'm hoping that I don't have to switch back to max/msp to go further (i much prefer the chuck environment), so I thought i'd give this one more bump on the list to see if there may be a fix in SCM, or otherwise in the pipeline somehow. If anyone is able to fix this I'd be extremely grateful!

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score files?
by Tom Lieber 24 Feb '10

24 Feb '10

Are there any popular formats for writing scores for ChucK scripts? I know a lot of people consume MIDI or OSC messages from controllers or other software, but I'm looking for something ChucK reads so that it's on ChucK's clock. -- Tom Lieber http://AllTom.com/ http://ckvlang.org/

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ugens of type 'DAC' have no input
by David Loberg Code 20 Feb '10

20 Feb '10

The following error keeps popping up (seemingly randomly) when launching shreds in mini-Audicle (0.2.0 gidora) "ugens of type 'DAC' have no input" This seems absurd that the DAC can't accept input. It is happening on multiple MacBooks (2.13 GHz intel Core 2 Duo. OS X 10.5.8) with different shreds. I can launch the programs from Terminal, but some of them don't function correctly in that environment (particularly things dealing with the tilt-sensor). Help. david David Loberg Code School of Music Western Michigan University Kalamazoo, MI 49008 code(a)wmich.edu

2 2

late binding
by Beinan Li 2 10 Feb '10

10 Feb '10

Hi Chuckists, I'd like to dynamically switch instrument as in my small code (chuck instr.ck my_chuck.ck) // instr.ck Class MyInstrument { StkInstrument@ m_whatever; Public void Play(dur duration) { m_whatever.noteOn(1); duration => now; m_whatever.noteOff(1); } } // my_chuck.ck MyInstrument dummy; Mandolin man => dummy.m_whatever; Dummy.m_whatever => dac; 1::second => dur d; dummy.Play(d); Then I got this error: [chuck](VM): NullPointerException: (UGen link) in shred[id=5:my_chuck.ck], PC=[46] Where am I wrong with this late binding? Thanks, Beinan

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GenX subclasses not assigning properly (using @=>)
by Andrew C. Smith 10 Feb '10

10 Feb '10

I've got this public class that goes like this: Phasor p => GenX g => env; with the assumption that I can just do a Gen9 gen @=> myObject.g; and have it all work out. However, this doesn't seem to be working. I do this: Gen9 gen; [1.0, 0.6, 0.3, 1.75, 0.1, 0.1] => gen.coefs; gen @=> s[i].g; and it gives me no sound, but if I change the GenX in the public class to Gen9 then it works. I've seen this work before with other things, so what am I doing wrong here? I'm not getting any compiler errors or warnings, either. I'm wondering if maybe it's calling some kind of earlier method, and not a more specific one. I've tried doing .lookup(int) on the Gen9 and it totally works, and when I do <<< s[i].g.toString() >>> it gives me "Gen9:1777af20" : (string). Sound just doesn't work though. Anyway, any help is appreciated here--I'm totally stuck on this one. Andrew

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FileIO.read( int ) -- why not implement?
by Andrew C. Smith 08 Feb '10

08 Feb '10

Hey list, it's been a while. I've got this quick little script for reading in Scala files, and there's a particularly important part of it that goes like this: if (scale.more() && scale.read(1) == "/") { if (scale.more()) { scale.readInt(1) => den; } } Basically, I'm just reading in from the file (FileIO scale) to see if the next character is a slash. If so, it's a ratio and I assume that the next number is the denominator. However, I had to go in and un-comment the whole FileIO.read(int) section in the source code. I haven't had any problems with it and can't figure out why it was commented out. It seems so useful to just read a particular number of characters, but this workaround means that I can't share my code with anyone else very easily. Also, we had that wish list going and no one ever said (at least not that I saw) "regular expressions." But, seriously, that would be so helpful for parsing outside information. And I think you all know how much fun it is to pump random outside data through algorithms. I don't exactly see how the FileIO thing is particularly useful unless there's some way of parsing the data. What have you all come up with? Is anyone using FileIO? What about a Floss addition? Nice manual, by the way. Good work list. Andrew

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Fwd: hotswapping UGens
by Kassen 08 Feb '10

08 Feb '10

Forward of a old message for Andrew to illustrate a technique related to his question. Please note that this technique is squarely in the "powertools can maim" category; it's very powerful, getting around some of ChucK's limitations but it runs right next to the edge of where the VM will crash because of the casting. Kas. ---------- Forwarded message ---------- From: Kassen <signal.automatique(a)gmail.com> Date: 21 January 2009 16:14 Subject: hotswapping UGens Fellow ChucKists, Inspired by Scott's explanation of casting I thought I'd try a new trick that may be quite interesting for livecoding. first run this file; ----------------------------- new UGen @=> Foo.instrument; public class Foo { static UGen @instrument; spork ~attach(); fun void attach() { while(1) { if(!instrument.isConnectedTo( dac )) instrument => dac; second => now; } } } Foo foo; new Sitar @=> foo.instrument; //your melody goes here while(second => now) 1 => (foo.instrument $ Sitar).noteOn; -------------------------------------------- Then run this to hot-swap the UGen while the original code runs; -------------- new Shakers @=> Foo.instrument; ----------------------- Sadly this does need that "attach" function as assignment breaks the link to the dac. I'm not sure I feel that's desirable behaviour but at least we can now hotswap UGens without crashing. I don't think I succeeded in that before. Yours, Kas.

1 0

pulse width modulation
by Michael Heuer 08 Feb '10

08 Feb '10

I'm trying to model the following in ChucK "OSC1, OSC2, and an LFO (Low Frequency Oscillator) Modulation: OSC1 produces a simple square wave tone, the pulsewidth of which is modulated with OSC2, and then amplitude modulated with the LFO oscillator." I think I understand the LFO amplitude modulation part, but I don't understand what pulse width modulation with osc2 means. SqrOsc osc1; SqrOsc osc2; SqrOsc lfo; Gain master; lfo => blackhole; osc1 => master; 220.0 => osc1.freq; 0.8 => osc1.gain; 20.0 => lfo.freq; 0.9 => lfo.gain; fun void updateAtSampleRate() { while (true) { ((lfo.last() + 1.0) / 2.0) * 0.8 => osc1.gain; 1::samp => now; } } master => dac; spork ~ updateAtSampleRate(); 2::second => now;

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Mind control
by Hans Aberg 07 Feb '10

07 Feb '10

CNN had a story about this. A bit pricey, but an interesting interface: http://www.neurosky.com/ http://www.neurosky.com/mindset/devtools.html http://developer.neurosky.com/ Hans

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