June 2008 - chuck-users - lists.cs.princeton.edu

Functional Chuck?
by mike clemow 08 Jun '08

08 Jun '08

Hey folks, Anyone else really wish that Chuck supported higher order functions??? check it out. This doesn't work, but i'd love for it to work: // a function that returns an int fun int fn( int n ) { return n + 3; } // a function that takes a function and an array of ints // and returns an array of ints which correspond to the action // of that function on each int in the original array fun int[] mapInt( function fn, int list[] ) { int results[list.cap()]; for( 0 => int i; i < list.cap(); i++ ) { fn( list[i] ) => results[i]; } return results; } [1, 2, 3, 4, 5] @=> input; Add3 add3; mapInt( add3, input ) => int output[]; <<< output[2] >>>; // should print 6 -- I just wish that functions could take other functions as parameters and return functions as their return value. I think that would make sense. Functions, I find are more powerful than classes in Chuck. Also, why is "function" a keyword? cheers, mike -- http://semiotech.org http://deadlylittlepills.com/michael

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list of filenames of a directory
by Renato Fabbri 08 Jun '08

08 Jun '08

Hello ChucK-List, I wonder from time to time how a ChucK script is to access the filenames of a directory. I haven't figured that out still, has someone? thanks, renato

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Bay Area Computer Music Technology Group (BArCMuT) @ Digidesign, Thursday
by Noah Thorp 08 Jun '08

08 Jun '08

Bay Area Computer Music Technology Group (BArCMuT) 7pm Thursday June 12th 2008 @ Digidesign 2001 Junipero Serra Blvd, Daly City , CA 94014 RSVP Here: http://electronicmusic.meetup.com/152/calendar/6921840/ Thank you to Digidesign for hosting our June meetup! Please note that you must RSVP to be admitted to the event at Digidesign: http://electronicmusic.meetup.com/152/calendar/6921840/ The presenters this month will be: * Digidesign project manager and electronic music composer Bobby Lombardi (http://www.digidesign.com) will present on topics in Plug-In design. A video on his recent project, the guitar amp modeling plugin Eleven, can be seen here in the "Behind Eleven" video: http://www.youtube.com/watch?v=nAzyRm0zm_U&feature=user * Rubyist Giles Bowket will present on "Archaeopteryx: A Ruby MIDI Generator". A talk that he gave on this evolving project at the ruby conference GoRuCo is posted here: http://goruco2008.confreaks.com/02_bowkett.html * CNMAT Researcher Andrew Schmeder will present on the micro-OSC project. Micro-osc is Open Sound Control (OSC) running natively on a $25 PIC18F microcontroller board. The firmware itself is scheduled to be released in June. Andy will bring instruments and sensors built on the platform and will also give a quick review the OSC format. More about OSC: http://opensoundcontrol.org/introduction-osc * Lightning talks from 7 - 7:30pm. Adam Murray on Max & jRuby, Ge Wang on the formation of the Laptop Orchestra of the Left, and you? If you would like to give a 5 minute lightning talk on a project you are working on, let me (Noah Thorp) know in advance or at the event. Please RSVP as there will be sign in at the front desk: http://electronicmusic.meetup.com/152/calendar/6921840/ Note, this one is on the second Thursday of the month (June 12th) rather than our usual first Thursday of the month. Also, we are starting at 7pm rather than 7:30 to make room for lightning talks and these excellent presenters. Snacks will be provided. All the best, Noah Thorp Bay Area Computer Music Technology Group (BArCMuT) Organizer

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Yet another joystick...
by Martin Ahnelöv 08 Jun '08

08 Jun '08

Hello ChucKers! This came down the microsound-pipe, and I thought I should share. A modular joystick that doesn't seem to be very comfortable to play games on, but it's probably great as an audio control surface! <http://edimensional.com/product_info.php?cPath=24&products_id=143&osCsid=ed…> <http://benheck.com/> Gasten

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Return values of sporked functions?
by mike clemow 07 Jun '08

07 Jun '08

Hello list, Couldn't find this one in the manual. Where do sporked funcitons return to? How do I get the return value of a spoked function? fun int addThree( int i ) { return i + 3; } spork ~ addThree( 2 ); ...5? cheers, mike -- http://semiotech.org

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sending program change
by Atte André Jensen 06 Jun '08

06 Jun '08

Hi I'm trying to send program change messages from chuck, but fail. I've been looking at stuff like this: https://lists.cs.princeton.edu/pipermail/chuck-users/2007-January/001426.ht… http://www.rattus.net/~packrat/audio/ChucK/files/midisender.ck Using the first URL (a post from Kassen), I try this: 192 => midimessage.data1; 3 => midimessage.data2; bcrMidiOut.send(midimessage); But get "[chuck](via RtMidi): RtMidiOut::sendMessage: event parsing error!". Note: I can send 3 byte messages on the port without problems, I'm thinking it's the 2 byte nature of program change that I doesn't handle correctly. I'm not too much into the deeper working of neither midi messages or what chuck does, so if someone could point me in the right direction, I'd be thankful! -- peace, love & harmony Atte http://atte.dk | http://myspace.com/attejensen http://anagrammer.dk | http://modlys.dk

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CCRMA 2008 Workshops
by Juan-Pablo Caceres 05 Jun '08

05 Jun '08

Hi there! Please see the workshop announcement below and distribute to any interested participants or bulletin boards! Fliers here: CCRMA Workshop General Annoucement: http://ccrma.stanford.edu/workshops/2008/workshopflyer08.pdf Physical Interaction Design Announcement: http://ccrma.stanford.edu/workshops/2008/pid2008-flyer.pdf Thanks! ps. Many apologies for cross postings. ===== CCRMA Summer Workshop for 2008 The Center for Computer Research in Music and Acoustics at Stanford University is happy to announce its offering of intensive programs where top educators and researchers from the fields of music, engineering, and computer science present a detailed study of specialized subjects. The workshops are one or two weeks long. The workshops are open to the public. Each day begins at 9:00 am and ends at 5:00 pm with an hour for lunch on your own. Course tuition and fees will vary by location. Workshops located at CCRMA will be $650 for one week and $1200 for two weeks. Fees may be associated for lab material. July 23 - July 4 Digital Signal Processing: Spectral and Physical Models July 7 - July 18 Physical Interaction Design July 21 - August 1 Music Information Retrieval August 4 - 15 Cell Phone Orchestra August1 8 - 22 Perceptual Audio Coding For more information and online registration on these and other CCRMA workshops, please visit: http://ccrma.stanford.edu/workshops/2008 Contact info: Tricia Schroeter, CCRMA Administrator Stanford University Center for Computer Research in Music and Acoustics, Knoll, Room 301 Stanford, CA 94305-8180 650-723-4971 ext. 320 (office) 650-723-8468 (fax)

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Beat Slicing
by Jonathan Siemasko 05 Jun '08

05 Jun '08

Hello ChucK people, Been following the list for a while now but this is my first post. I am trying to create a Random Chuck Beat slicer. Basically input any loops, set the rate and set the number of slices to use and it will automatically create random breakbeats from it. The problem is when I set the playback rate to anything other then half, single, double, etc. slices stop lining up properly. Debugging messages in the code produce the expected numbers but the audio is clearly not lining up. I have many other features planed but am unable to figure out what is going on here. Is my Math wrong? Is the SndBuf object twitchy? I have only tested it on windows in the miniAudicle so far. -Jonathan 1 => float rate; 8 => int NumOfSlices; SndBuf s => dac; "C:/breaks/amenst.wav" => s.read; s.samples() => s.pos; //Don't Play on Start 0.5 => s.gain; rate => s.rate; (s.samples() / rate) / NumOfSlices => float SliceSize; SliceSize::samp => dur SliceDur; SliceDur - (now % SliceDur) => now; //Sync while(true){ (Std.rand2(0, NumOfSlices - 1) * SliceSize) $ int => int NewPos; NewPos => s.pos; SliceDur => now; }

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a example of thinking on interface mapping
by Kassen 02 Jun '08

02 Jun '08

Dear fellow ChucKists, This weekend I was experimenting some more with my tilt-sensing joypad, adding a -so far crude- granualar way of playing back samples. When I handed it to some friends to try it turned out people subconciously expected something interesting to happen with vigorous shaking. This sounded like a interesting idea so I made crude and so far badly calibrated implementation. What I'm doing is checking the square of the change in bot axis since the last time I polled them and adding both of those to a "shake" variable from which I'm also subtracting a value periodically (at least as long as it's above 0). The resulting parameter seems to do a decent job of detecting whether the joypad is currently being shaken and if so how hard. As hard shaking tends to build up the parameter I have to let it return to 0 faster if it's higher. The result is -so far- being used to scale randomisation in the grain playback rate. This will need tuning (as well as a cleanup...) and I wonder if left-right shaking may need to be diffent from forward-backwards shaking and how important the period of "re-stabilising" of the whole thing is. So; this is still in a early stage, I only started at it last afternoon but it might be the sort of practical example that works for some people as a illustration of how I try to deal with this sort of subject. BTW, I set this sort of thing loose on my friends because I find observing how they interact with it leads to different insights then I'd get on my own, insights that often make interfaces perform bettter for myself as well. Hope that was of any use/interest. Yours, Kas.

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