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

MIDI-controlled synth example?
by Darren Landrum 23 Dec '07

23 Dec '07

Hi, all! I now have my MIDI controller and new computer all set up, and I wanted to give real-time control of ChucK a shot. I looked through the examples in the MIDI folder, but I couldn't make anything work, and couldn't really understand the code. So I was wondering if anyone might have a simple MIDI-controlled synth program out there that I can try out and dissect, as I learn so much better from example. Thank you! Regards, Darren Landrum PS - Happy Holidays to all!

1 1

Uana tutorials/examples
by pibsid＠suomi24.fi 23 Dec '07

23 Dec '07

Hi. I think it's wonderful that ChucK can do analysis now. I know what the FFT is but having very little experience with Fourrier transforms I'm quite in the dark on how to modify them. I'm trying to create a realtime pitch-shifter but I'm having trouble getting the phases of successive segments to match. Is there anyone here who knows more about FFT and could write a pitch-shifter example. The short examples that come with Chuck can get people started on how to use the Uana objects but more detailed examples like a phase-vocoder or a pitch-shifter would really help clear some heads on how to truly utilize the power of analysis in ChucK. Cheers! -Pyry Pakkanen (Frostburn)

1 0

chuck and midi clock (again), ignoreTypes() method
by Julien Canet 21 Dec '07

21 Dec '07

Dear All, I am learning chuck and I've made some scripts for the monome 40h interface (if someone wants I can post them). I really need to sync my script with another software, using MIDI. I saw on the users mailing list ( https://lists.cs.princeton.edu/pipermail/chuck-users/2006-April/000503.html ) that midi sync wasn't possible. I didn't really understood why at first, because I thought we just have to make a midi input handler that waits for MIDI clock messages, just like the example in the message : 0 => int device; // number of the device to open (see: chuck --probe) MidiIn min; // the midi event MidiMsg msg; // the message for retrieving data if( !min.open( device ) ) me.exit(); // open the device spork ~ handleMIDI(); fun void handleMIDI() { while (1) { min => now; // wait on the event 'min' while( min.recv(msg) ) // get the message(s) { if (msg.data1 == 248) { // MIDI Clock // Do clocky stuff, count to 24, determine delta-now, whatever } } } } So I wrote a little loop waiting for midi clock message, similar to the script above. I never received midi clock messages... (I am sure they are sent using a MIDI monitor). I read on chuck forum that MIDI clock messages were not parsed. So I had a quick look into Chuck source code and try to found why. I said quick look because I do not understand the whole code to 100%, I've just tried to find more about these MIDI clock messages. I saw that in the midiInputCallback, the midi time code and tick messages (and some other midi messages) are ignored depending on some RtMidiInData flags : the ignoreFlags, initialized to true (ignoreFlags set to 7 in fact) in the constructor. If these flags are true, the size of the message is set to 0 and it is ignored. I saw that there is a method called RTMidiIn::ignoreTypes that can changes these flags. But my BIG question : how to access this ignoreTypes method in chuck language? I recompiled chuck with ignoreFlags initialized to 0. And now I received them... So what is the problem with the midi clock messages? Why disabling them? Can the end-user re enable them without recompiling? Thanks and congratulations for chuck, this is really wonderful, Best regards, Julien.

3 4

.op(0)?
by Kassen 19 Dec '07

19 Dec '07

Fellow ChucKists, Dr. Spankenstein (Rhys) and me just went over some topics on the forum and a question came up about .op(0) in relation to saving CPU time. .op(0), according to the docs stops processing in the Ugen and makes it return only 0's but does that mean it also stops it from pulling Ugens before it in the chain like unchucking does? Clearly it's different from unchucking as .op(0) should allow Ugens after it to keep running (for example to avoid clicks caused by resonant filters dropping out) but I'm not sure how it relates to Ugens after it and can't find any documentation on this. This could become relevant if low on CPU while wanting to preserve click-free sound quality. Yours, Kas.

1 0

forum vs. list (was: simple distortion/clipping)
by Stephen Sinclair 17 Dec '07

17 Dec '07

> It turns out that there are people who prefer a forum and others prefer a > list while yet others (like me) think both are nice in different ways. Yes, I understand this. I used to be more of a forum person, but things changed for me, essentially, when I got my gmail account. I find the 'label' system so good for tracking mailing lists that I can't imagine going back. While previously the idea of receiving huge amounts of mail offended me, nowadays checking on a forum just seems so chore-like to me. In any case, I've always found it funny that there aren't more forum-mailinglist combination systems out there, considering how similar the two concepts are. Some sort of phpBB-mailman integration could go a long way to solving that problem... I think there are some scripts available but it would probably take some work, and not necessarily be a good solution. > Somehow it looks like the forum appears more accessible to people who are > just starting out or are considering to jump in. The forum -so far- also > seems more conductive to colaborations, while the list tends to be more > in-depth on a technological level especially once the bugs hit the fan. I agree, there seems to be tons of cool ideas on the forum, I wish I'd checked it out earlier. It's nice to see people exploring chuck in various ways and coming up with UGen tricks as opposed to just discussing language semantics and such. (Though I'm a language nerd so I don't mind.. ;-) > points as well as a public shared VM capable of streaming for online > jam-sessions but until then I think that so far the price is worth the > gains. That is a really cool idea... and totally do-able. ajax-audicle anyone?? Steve

2 1

MOTU UltraLite interface
by Gregory Brown 17 Dec '07

17 Dec '07

Hello all, I am thinking of getting the MOTU UltraLite interface to use with my MacBook Pro. Has anyone had any positive/negative experiences using this device with ChucK? I am particularly interested in exploring the multi- channel in/out capabilities. Thanks, Greg

3 3

simple distortion/clipping
by Stephen Sinclair 17 Dec '07

17 Dec '07

Hi, I've been trying to figure out how to do some simple distortion / clipping in Chuck. I'm not sure I fully understand the GenX objects. Is this the best way to do it? Ideally I just want something that clips a waveform when it exceeds x or -x. Even better if the "corner" is somewhat rounded, but not necessary. I thought there might be a simple "Clip" UGen but it doesn't seem to exist. By the way, on a similar topic, what happens exactly when the signal input in "dac" exceeds [-1,1]? It doesn't really sound like clipping to me, so is it integer wrapping? I find my audio output significantly degrades (i.e., sound pops, goes silent, or makes strange unpleasant noises) when I exceed this limit, so I always have to fight to keep it within the correct range. Steve (currently working on my first chuck-related music performance!)

7 12

ChucK says "Chuck"
by Perry R Cook 17 Dec '07

17 Dec '07

In response to a couple of threads a while ago, I present a short program that makes ChucK say "Chuck." I'm working on a complete Klatt-like speech synthesizer that will take ARPABET as input and render speech in ChucK in real time. Don't hold your breath, but I'll try to post something that does more than just say "chucK" sometime over the holidays. Best, PRC

3 2

FYI: storing light with sound
by AlgoMantra 16 Dec '07

16 Dec '07

http://www.nature.com/news/2007/071213/full/news.2007.376.html Just thought this might be nice with your morning cuppa. -- ------- -.- 1/f ))) --. ------- ... http://www.algomantra.com

1 0

microphone in ubuntu gutsy
by AlgoMantra 15 Dec '07

15 Dec '07

Dear All, Attached is the screenshot of my $alsamixer status in Ubuntu Gutsy. audio outputs are all working fine, but I can't seem to get my external microphone working with anything - Chuck programming language, Audacity, etc. Any ideas on how to fix this? I'm on a Compaq Presarion C500. And here is a portion of my $lspci which might be relevant here: *00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01) 00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 01) 00:1c.2 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 3 (rev 01)* thanks in advance, -- fadereu ------- -.- 1/f ))) --. ------- ... http://www.algomantra.com

3 6