<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Note there are also a few different sample-hold chubgraphs in LiCK<div class=""><br class=""></div><div class=""><a href="https://github.com/heuermh/lick/tree/master/lick/lfo" class="">https://github.com/heuermh/lick/tree/master/lick/lfo</a></div><div class=""><br class=""></div><div class="">Cheers!</div><div class=""><br class=""></div><div class=""> michael</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Apr 20, 2020, at 2:10 PM, Forrest Curo <<a href="mailto:treegestalt@gmail.com" class="">treegestalt@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="">Yes, I'm interested!</div><div class="">Whatever turns out easier, one could apply it to note lengths, amplitudes, other parameters in same way for same reasons: a bit of patterned randomness.<br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Apr 20, 2020 at 11:32 AM Mario Buoninfante <<a href="mailto:mario.buoninfante@gmail.com" class="">mario.buoninfante@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr" class=""><div class="">Hi,</div><div class=""><br class=""></div><div class="">In case you're interested I made a SampHold chugin that you can find here: <a href="https://github.com/mariobuoninfante/ChucK_chugins" target="_blank" class="">https://github.com/mariobuoninfante/ChucK_chugins</a><br class=""><br class=""></div><div class="">Cheers,</div><div class="">Mario<br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, 20 Apr 2020 at 18:05, Forrest Curo <<a href="mailto:treegestalt@gmail.com" target="_blank" class="">treegestalt@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr" class="">"A sample and hold uses a periodic wave as an input. The wave is sampled at regular<br class="">intervals. The resulting values are used as a control. It "samples" the wave and "holds" that<br class="">value until a new value is sampled. It can be thought of as an analog to digital converter with<br class="">a low frequency sampling rate (though technically the wave being sampled is also digital).<br class="">The effect is similar to a strobe light or motion picture film taking snapshots of a smooth<br class="">process. That smooth process is then quantized into discrete steps.<br class=""><div class=""><br class=""></div><div class="">"How is this useful in synthesis? Why would you want to freeze-frame a wave form?</div>The idea is that even though the sample rate is too low to accurately represent the true shape<br class="">of the wave, patterns will still emerge because the wave is periodic, and the sample rate is<br class=""><div class="">periodic."</div><div class=""><br class=""></div><div class="">[David Cottle, _Computer Music with Examples in Supercollider 3]</div><div class=""><br class=""></div><div class="">(This can be done in ChucK; the sndBuf containing the wave can be sampled via .valueAt without directly playing it.)<br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Apr 19, 2020 at 9:50 PM Forrest Curo <<a href="mailto:treegestalt@gmail.com" target="_blank" class="">treegestalt@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr" class=""><div class="">I've achieved dreadfulness with this. Okay, will vary the rhythm etc and reduce the range, get a more interesting scale, but... hmm!</div><div class="">SawOsc s => JCRev r => dac;<br class="">.1 => s.gain;<br class="">.1 => r.mix;<br class="">1 => int incsamp;<br class="">0 => int ps;<br class="">1 => float height;<br class="">0 => float maxsofar;<br class="">0 => float freq;<br class="">SndBuf buf;<br class=""><br class="">"/home/forrest/chuck/examples/basic/om.wav" => buf.read;<br class=""><br class="">buf.samples() => int numSamples;<br class=""> Std.rand2(1, numSamples-1) => incsamp;<br class="">while(true){<br class=""> (incsamp + ps) % numSamples => ps;<br class=""> buf.valueAt(ps) + 0.125 => height;<br class=""> Std.mtof(Math.ceil(Std.fabs(500.0 * height)) ) => freq => s.freq;<br class=""> <br class=""> if(freq > maxsofar) {<br class=""> freq => maxsofar;<br class=""> <<< maxsofar >>>;<br class=""> }<br class="">0.75::second => now;<br class="">}<br class=""><br class=""><br class=""><br class=""><br class=""><br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Apr 19, 2020 at 1:42 PM Forrest Curo <<a href="mailto:treegestalt@gmail.com" target="_blank" class="">treegestalt@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr" class=""><div class="">Um. that works.</div><div class="">So does this:</div><div class="">SndBuf s => blackhole; <br class="">"/home/forrest/chuck/examples/basic/om.wav" => s.read;<br class="">float samples;<br class="">0 => int i;<br class="">while (s.pos() < s.samples()) {<br class=""> <<< s.last() >>>;<br class=""> s.pos() => i;<br class=""> (s.valueAt(i)) => samples;<br class=""> <<< samples >>>;<br class=""> samp => now;</div><div class="">}</div><div class=""><br class=""></div><div class="">I was having trouble trying to read a sndBuf like an array, or put its contents into an array.</div><div class="">Maybe I was reading numbers off the end of the file. Declaring <br class=""></div><div class="">'float samples[]; '</div><div class="">and doing</div><div class="">'s.valueAt(i) => samples[i];'</div><div class=""><br class=""></div><div class="">got me a 'Null pointer' error. <br class=""></div><div class=""><br class=""></div><div class="">Stumbling over syntax, I guess. Thanks for help!<br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Apr 19, 2020 at 10:54 AM Perry Cook <<a href="mailto:prc@cs.princeton.edu" target="_blank" class="">prc@cs.princeton.edu</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">This is truly odd. I don’t have easy means to test it. I don’t <br class="">
know why it wouldbe broken dependent on the dac, however.<br class="">
<br class="">
For fun you might try something like this, just to verify that the<br class="">
valueAt() function is what’s busted.<br class="">
<br class="">
SndBuf s => blackhole; <br class="">
“Fred.wav” => s.read;<br class="">
<br class="">
while (s.pos() < s.samples()) {<br class="">
<<< s.last() >>>;<br class="">
samp => now;<br class="">
}<br class="">
<br class="">
PRC<br class="">
<br class="">
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> 1. sndBuf.valueAt (Forrest Curo)<br class="">
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> ----------------------------------------------------------------------<br class="">
> <br class="">
> Message: 1<br class="">
> Date: Sun, 19 Apr 2020 07:30:15 -0700<br class="">
> From: Forrest Curo <<a href="mailto:treegestalt@gmail.com" target="_blank" class="">treegestalt@gmail.com</a>><br class="">
> To: ChucK Users Mailing List <<a href="mailto:chuck-users@lists.cs.princeton.edu" target="_blank" class="">chuck-users@lists.cs.princeton.edu</a>><br class="">
> Subject: [chuck-users] sndBuf.valueAt<br class="">
> Message-ID:<br class="">
> <CAAn-Ecy0LKVHCWmoUL2Y7w67rsibhRAHOOkN1neZyU=az3vm=<a href="mailto:g@mail.gmail.com" target="_blank" class="">g@mail.gmail.com</a>><br class="">
> Content-Type: text/plain; charset="utf-8"<br class="">
> <br class="">
> Using chuck linux-jack this gives me reasonable numbers between -1 and 1.<br class="">
> Using chuck linux-alsa I'm able to play the file I've read into sndBuf; but<br class="">
> trying to copy it via .valueAt gives absurdly high ["out of range"] numbers<br class="">
> at each point. [It can be a different high number different times I run<br class="">
> chuck, but the number it is turns up at every point I sample.]<br class="">
> <br class="">
> Is there a fix for this? Aside from using jack on a computer where it<br class="">
> befnurgles the midi?<br class="">
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