[chuck-users] playing SndBuf backward - difference between SndBuf and LiSa

Hi Perry, Thanks and sorry for all the trouble. In the meanwhile i posted another mail to the mailinglist (answered by d.loberg.code@wmich.edu) And he said that in SndBuf , in order to play backward, you have to put de pos to -1 total lenght. Suppose your file has 1000 samples. Then you have to start from 1000 - 1 = 999. This effectively works. In LiSa on the contrary you can start at 1000. Cheers, herman ________________________________ Van: chuck-users-bounces@lists.cs.princeton.edu namens Perry Cook Verzonden: woensdag 12 februari 2020 22:04 Aan: chuck-users@lists.cs.princeton.edu Onderwerp: Re: [chuck-users] playing SndBuf backward It is playing backward from 0, to 0, so it does nothing. You have to set .pos to .samples() (point to the end, so it can play backward). In the example, you’d need to advance time to let it play forward: mySndBuf.samples() :: samp => now; // you’d hear it play forward then set rate to -1, then advance time again to hear it backward. PRC Looking at our book, I see that you didn’t copy all the lines. You’ve got to advance time to hear anything in ChucK. // 4.3 Playing sounds in reverse // by ChucK Programmer 4102, yluJ #A SndBuf mySound => dac; me.dir()+"/audio/hihat_04.wav" => mySound.read; #1 mySound.samples() => int numSamples; #2 // play sound once forward 0 => mySound.pos; numSamples :: samp => now; #3 // and once backward numSamples => mySound.pos; #4 -1.0 => mySound.rate; #5 numSamples :: samp => now;

On Feb 12, 2020, at 1:30 PM, chuck-users-request@lists.cs.princeton.edu wrote:

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Today's Topics:

1. Re: playing SndBuf backward (Perry Cook) 2. Error in book "Programming for Musicians and digital artists by Ge Wang" ? (herman verbaeten) 3. playing SndBuf backward (herman verbaeten)

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Message: 1 Date: Wed, 12 Feb 2020 12:58:36 -0800 From: Perry Cook To: chuck-users@lists.cs.princeton.edu Subject: Re: [chuck-users] playing SndBuf backward Message-ID: <6DBAE4AC-7E7E-413D-8059-8CB929B9AC78@cs.princeton.edu> Content-Type: text/plain; charset=utf-8

You can set the .pos to wherever you like, and set the .rate to a negative number. The sample will happily play backward to zero and stick there (unless you have .loop set).

PRC

Sent from my iPad

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On Feb 12, 2020, at 9:00 AM, chuck-users-request@lists.cs.princeton.edu wrote:

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1. Re: => now (herman verbaeten)

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Message: 1 Date: Tue, 11 Feb 2020 18:11:09 +0000 From: herman verbaeten To: ChucK Users Mailing List Subject: Re: [chuck-users] => now Message-ID:

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Thanks again Mario,

I have another question: Can you recommend a procedure to address individual samples of a wave-file you read into the SndBuf. I discovered a way to play a part of a wave file starting at a certain point using ".pos". I also wonder if there's a way to play it backwards (reverse).

Cheers,

herman

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Message: 2 Date: Wed, 12 Feb 2020 21:15:51 +0000 From: herman verbaeten To: chuck mailing list Subject: [chuck-users] Error in book "Programming for Musicians and digital artists by Ge Wang" ? Message-ID:

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Hi,

I was looking in your book and copied listing 4.3 " Playing a sound file backward" But it didn't work. Hopefully i did everything correctly. It did perform the first (forward) part but during the reverse part i heard nothing. Can you please help me....

Kind regards,

Herman

// copy Listing 4.3 Playing a sound file backward // from Programming for Musicians and digital artists by Ge Wang

me.sourceDir() + "sample.wav" => string filename; if( me.args() ) me.arg(0) => filename;

// the patch SndBuf mySound => dac;

// load the file in buf filename => mySound.read;

mySound.samples() => int numSamples;

0 => mySound.pos; // this was ok numSamples::samp => now;

numSamples => mySound.pos; // This was not heard. Athough the program stayed in VM. -1.0 => mySound.rate; numSamples::samp => now;