<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>I especially like the end result of Julius' experiments </div><div>with his CryBaby:</div><div><br></div><div>
<div class="page" title="Page 29">
<div class="layoutArea">
<div class="column">
<ul>
<li style="font-size: 11.000000pt; font-family: 'CMSY10'">
<p><span style="font-size: 11.000000pt; font-family: 'CMR10'">The estimated Q values printed at the end are<br>
</span><span style="font-size: 11.000000pt; font-family: 'CMMI10'">Q </span><span style="font-size: 11.000000pt; font-family: 'CMR10'">= [9</span><span style="font-size: 11.000000pt; font-family: 'CMMI10'">.</span><span style="font-size: 11.000000pt; font-family: 'CMR10'">4</span><span style="font-size: 11.000000pt; font-family: 'CMMI10'">, </span><span style="font-size: 11.000000pt; font-family: 'CMR10'">4</span><span style="font-size: 11.000000pt; font-family: 'CMMI10'">.</span><span style="font-size: 11.000000pt; font-family: 'CMR10'">0</span><span style="font-size: 11.000000pt; font-family: 'CMMI10'">, </span><span style="font-size: 11.000000pt; font-family: 'CMR10'">1</span><span style="font-size: 11.000000pt; font-family: 'CMMI10'">.</span><span style="font-size: 11.000000pt; font-family: 'CMR10'">9]</span><span style="font-size: 11.000000pt; font-family: 'CMMI10'">,
</span></p>
<p><span style="font-size: 11.000000pt; font-family: 'CMR10'">and the estimated pole frequencies are<br>
</span><span style="font-size: 11.000000pt; font-family: 'CMMI10'">f</span><span style="font-size: 8.000000pt; font-family: 'CMMI8'; vertical-align: -2.000000pt">p </span><span style="font-size: 11.000000pt; font-family: 'CMR10'">= [464</span><span style="font-size: 11.000000pt; font-family: 'CMMI10'">, </span><span style="font-size: 11.000000pt; font-family: 'CMR10'">838</span><span style="font-size: 11.000000pt; font-family: 'CMMI10'">, </span><span style="font-size: 11.000000pt; font-family: 'CMR10'">2252] Hz. </span></p>
</li>
</ul>
</div>
</div>
</div><div>This, plus other data from that article, pretty much </div><div>sets you up to use a 2pole resonator, and just interpolate </div><div>between (and beyond) those values.</div><div><br></div><div>Think ill code this up in ChucK this afternoon!!</div><div><br></div><div>Prc</div><div><br></div><br>Sent from my iPad :-)</div><div><br>On Oct 5, 2013, at 7:32 AM, Stephen Sinclair <<a href="mailto:sinclair@music.mcgill.ca">sinclair@music.mcgill.ca</a>> wrote:<br><br></div><blockquote type="cite"><div><span>On Sat, Oct 5, 2013 at 1:23 AM, Robert Oschler <<a href="mailto:robert.oschler@gmail.com">robert.oschler@gmail.com</a>> wrote:</span><br><blockquote type="cite"><span>Hello all,</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>I'm a veteran C++ programmer but I am brand new to the STK. Although</span><br></blockquote><blockquote type="cite"><span>somewhat math challenged I do know basic DSP principles. Is there a</span><br></blockquote><blockquote type="cite"><span>built-in effect that creates a good Wah-Wah pedal effect? If so,</span><br></blockquote><blockquote type="cite"><span>where do I start poking around to use it? If not, are there some</span><br></blockquote><blockquote type="cite"><span>low-level filter effects I can use to build one? Or do I have to go</span><br></blockquote><blockquote type="cite"><span>it alone and create a separate block of code that does the DSP</span><br></blockquote><blockquote type="cite"><span>operations necessary to create the Wah effect?: Note, need it to be</span><br></blockquote><blockquote type="cite"><span>fast enough for real-time processing.</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span><a href="http://en.wikipedia.org/wiki/Wah-wah_pedal">http://en.wikipedia.org/wiki/Wah-wah_pedal</a></span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>For the guitarists out there, I want to create a truly solid Wah</span><br></blockquote><blockquote type="cite"><span>effect that really sounds like a mouth opening and closing around the</span><br></blockquote><blockquote type="cite"><span>sound, something with some body to it, instead of an adjustable cutoff</span><br></blockquote><blockquote type="cite"><span>filter that sounds more like someone simply twisting the Treble knob</span><br></blockquote><blockquote type="cite"><span>on a stereo (is there some resonance processing involved with</span><br></blockquote><blockquote type="cite"><span>achieving an enhanced Wah effect?). I'm going to use the effect to</span><br></blockquote><blockquote type="cite"><span>process the sound output of my current STK waveform output.</span><br></blockquote><span></span><br><span></span><br><span>Hi Robert,</span><br><span></span><br><span>So there's a bit of work out there on wah wah pedal modeling if you</span><br><span>search google scholar. One that jumps out is Julius Smith's work</span><br><span>which specifically shows how to emulate the Cry Baby pedal, perhaps</span><br><span>it's of interest:</span><br><span></span><br><span><a href="https://ccrma.stanford.edu/realsimple/faust_strings/faust_strings.pdf">https://ccrma.stanford.edu/realsimple/faust_strings/faust_strings.pdf</a></span><br><span></span><br><span>In general (if i understand correctly) a wah wah pedal *is* just a</span><br><span>resonant low pass filter. You might be able to use STK's TwoPole</span><br><span>class to implement it.</span><br><span></span><br><span>Not sure if that answers your question though, since I don't know</span><br><span>exactly what you mean by "something with some body to it." (Not a</span><br><span>guitarist.)</span><br><span></span><br><span>By the way if you just want some good guitar effects and don't want to</span><br><span>implement it yourself I suggest checking out Guitarix:</span><br><span><a href="http://guitarix.sourceforge.net/">http://guitarix.sourceforge.net/</a></span><br><span></span><br><span></span><br><span>Steve</span><br><span></span><br><span>_______________________________________________</span><br><span>Stk mailing list</span><br><span><a href="mailto:Stk@ccrma.stanford.edu">Stk@ccrma.stanford.edu</a></span><br><span><a href="http://ccrma-mail.stanford.edu/mailman/listinfo/stk">http://ccrma-mail.stanford.edu/mailman/listinfo/stk</a></span><br></div></blockquote></body></html>