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

Fwd: Automated batch conversion of ck files to WAV
by Leonard Ritter 23 Jan '14

23 Jan '14

Hi there, I wrote this to Ge Wang on Twitter before but he's not been there since October, so I thought I'd better write here. I've used ChucK a few years ago and had quite some fun with it. I would like to use it as part of the game we are currently developing. The goal is to allow sounds to be customized to individual installations of the game, where they would then be played back by OpenAL to provide for positional 3D audio. As part of my prototyping, I wanted to write a simple Python script that is able to batch convert a stack of ck files to WAV, ideally sample precise (no leading or trailing silence). I thought that rec.ck would be perfect for achieving that but it seems I can't figure out a way to have recording end precisely when the main script is done playing, instead of recording indefinitely and waiting for abortion via the Ctrl+C key. Is there such a method? I'd be very thankful for advice. Cheers, Leonard -- Leonard und Sylvia Ritter, Duangle, GbR Ritter Altpieschen 9, 01127 Dresden Leonard.Ritter(a)duangle.com www.duangle.com Geschäftsführung: Sylvia Ritter, Leonard Ritter

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Re: [chuck-users] Raspberry pi and ChucK and performance
by Perry Cook 11 Jan '14

11 Jan '14

Thoughts from the battlefield: One nice thing about the Pi is that it supports many sample rates. So if you can run at 22.05k or even 16k or less, then you'll get much more bang for your buck. Also, you might look into using WvIn (non looping) or WavLoop (looping), rather than SndBuf, because I think I remember that these are slightly more efficient. Look into using some long delay lines (non-interpolating), with feedback. These can really fatten up a texture without requiring much CPU. Also be judicious about your efx, some will take more CPU than others. Finally, if a wave is not playing sound, unchuck it at the end of the chain, and it won't use any CPU while muted. Keeping track of what's actually sounding, and muting the rest (by unchuck) can really help. Prc Sent from my iPad :-) > On Jan 11, 2014, at 3:03 PM, chuck-users-request(a)lists.cs.princeton.edu wrote: > > Raspberry pi and ChucK and performance

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Raspberry pi and ChucK and performance
by Stuart McDonald 11 Jan '14

11 Jan '14

I've written a ChucK script to concurrently instantiate samples with their own effects chains with the aim of creating a kind of kaleidoscopic music box that randomly plays filtered longish samples (say up to two minutes). The box bit is intended to be a raspberry pi. Running on a pi the program maxes out at two concurrent samples and a modest effects chain for each. Ideally I'd prefer to double or even triple that so clearly I need to scale back my resource-intensive intentions, along with attempting to improve the pi's performance (overclocking, for example). There are concrete steps to take on both these fronts, but I have two concerns I'd be keen to get advice on: 1. Is ChucK the best electronic music platform to be doing processor-intensive tasks on a low-power processor? 2. Is building a processor-intensive composition on a raspberry pi (as opposed to building a hardware controller-related application) bordering on folly? I realise the second question is more open-ended and philosophical, but I'd be interested to hear other perspectives :) Many thanks Stuart

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Serial/Arduino & ChucK example
by Alan Brooker 06 Jan '14

06 Jan '14

Hi there I am using ChucK 1.3.2.0 (Chimera) with miniAudicle 1.3.0a on Ubuntu 12.04- I think the latest version can communicate with Arduino directly? Cant seem to find any examples so any advice or example code would be much appreciated. I am trying to build a simple step sequencer with *x5 potentiometer*s that send values to an arduino board and then into ChucK hopefully. Was hoping I could do this without OSC- thanks for helping this noob! Al

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language feature requests
by Michael Heuer 03 Jan '14

03 Jan '14

All, I added several language feature requests and bugs to the issue tracker on github at https://github.com/spencersalazar/chuck/issues Allow => from a UGen into a field/parameter #34 Add namespaces and import statements #33 Add constrain and lerp methods to Std or Math #32 Add constructors to class definitions #31 Order of class definitions in a file matters sometimes #30 Allow a class to implement more than one interface or extend more than one class #29 Add abstract and final class and method modifiers #28 now returns 0.0 from Chugen #27 These nudge the ChucK language towards Java in a lot of ways, perhaps not surprising given my background. I'm curious to know what others think. Cheers, michael

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New ChuGins for the new year!
by Joel Matthys 31 Dec '13

31 Dec '13

I've been hard at work developing new ChuGins, and I have them all working well, with proper documentation. I've only built them on Linux, but since I used the template, I assume they'll build just fine on Mac or Windows too. Here are my new ChuGins: - PitchTrack, a monophonic pitch tracker with good speed and accuracy even at low frequencies - GVerb, a quality stereo reverb with many adjustable parameters - Mesh2D, my favorite STK instrument that somehow never made it into ChucK. It's a great physical model of struck glass or metal plates. - Spectacle, an FFT-based spectral delay and EQ. These are all adapted from other sources, mostly RTcmix. You can clone the repo at https://github.com/jwmatthys/chugins Let me know if you have any questions! Joel

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function for creating 8 bit waveforms from expressions
by Ronni Montoya 31 Dec '13

31 Dec '13

Hi list, i been reading a paper that talks about an approach for generating sound that uses functions to directly shape waveforms. The function receives "expresions" as argument and it generates different kind of 8 bit waveforms from the expressions. An expression can look like this: f(t) = t * ( t >> 8 * ( t >>15 | t >> 8) & 20 | ( t >>19) * 5 >> t | t >> 3)) The paper describes the algorithm in this way: algorithm 1 : Construction of an 8-bit waveform of 8000Hz sample rate: The function has 2 inputs : Input 1) a functional expresion f(t) Input 2 ) time durations in seconds (d) Output: the waveform of an audio signal with seconds duration for t = 1 to d8000 do if f(t) ==NaN then q(t) <-- 0 else q(t) <-- mod(f(t)), 256) end if s(t) <-- 2 q(t)/255 - 1 end for If its possible to implement this approach for generating sound in chuck?? cheers R.

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KBHit events
by Manuel Bärenz 26 Dec '13

26 Dec '13

Hello again, I also wanted to demonstrate a simple sequencer prototype that lets me record a file and then plays it back to me. I've come this far: KBHit kb; me.sourceDir() + "/bum.wav" => string filename; adc => WvOut b => blackhole; filename => b.wavFilename; kb => now; b.closeFile(); SndBuf buf => dac; filename => buf.read; kb => now; But strangely, the program doesn't wait for the second kb event, but exits directly after the first key that I hit. Any ideas what I'm doing wrong? Best, Manuel

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chugin tutorial or docs?
by Joel Matthys 25 Dec '13

25 Dec '13

I'm trying to implement a good pitch tracker as a ChuGin. Is there any kind of tutorial or walk-through that anyone has done? A few questions: - Is it possible to create a UAna ChuGin or must it be a UGen? - How do you suggest implementing an FFT-based instrument which uses 1024 or 2048 sample frames for analysis? - Besides the CCRMA paper and the source code, is there any documentation of ChuGin programming? Thanks! Joel

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ChucK for live musicians
by joe higham 21 Dec '13

21 Dec '13

hi @ chuck-users lists I'm busy following the Coursera ChucK course provided by CAL Arts. As a live musician I was hoping to discover how one could use ChucK live (in the same way as Pure Data, Max/MSP etc). We've seen Ajay Kapur (whom I'm sure you all know) using his sitar in a live concert video made at CalArts, but no explanation followed. Unfortunately it seems that the course isn't going to cover this topic, so I've joined the list hoping people can help me out. Would it be possible to start giving me a few basic outlines for how to use ChucK via the adc (I'm a sax player). If you're interested (and if it works) here's a link to a thread created via CalArts and Coursera asking these questions: https://class.coursera.org/chuck101-001/forum/thread?thread_id=1429#post-77… You won't be able to comment but you will notice that we all wonder if one should pass via blackhole, if we should use a FFT etc. And more important, how? Thanks in advance Joe

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