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<section id="building-lfo-py-audio-control-of-parameters">
<h1>04-building-lfo.py - Audio control of parameters.<a class="headerlink" href="#building-lfo-py-audio-control-of-parameters" title="Permalink to this heading">¶</a></h1>
<p>One of the most important thing with computer music is the
trajectories taken by parameters over time. This is what
gives life to the synthesized sound.</p>
<p>One way to create moving values is by connecting a low
frequency oscillator to an object’s attribute. This script
shows that process.</p>
<p>Other possibilities that will be covered later use random
class objects or feature extraction from an audio signal.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <a class="sphinx-codeautolink-a" href="../../api/alphabetical.html#module-pyo" title="pyo"><span class="nn">pyo</span></a> <span class="kn">import</span> <span class="o">*</span>

<span class="n">s</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/server.html#pyo.Server" title="pyo.lib.server.Server"><span class="n">Server</span></a><span class="p">()</span><span class="o">.</span><span class="n">boot</span><span class="p">()</span>

<span class="c1"># Creates a noise source</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">n</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">Noise</span></a><span class="p">()</span>

<span class="c1"># Creates an LFO oscillating +/- 500 around 1000 (filter's frequency)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">lfo1</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">Sine</span></a><span class="p">(</span><span class="n">freq</span><span class="o">=</span><span class="mf">0.1</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mi">500</span><span class="p">,</span> <span class="n">add</span><span class="o">=</span><span class="mi">1000</span><span class="p">)</span>
<span class="c1"># Creates an LFO oscillating between 2 and 8 (filter's Q)</span>
<span class="n">lfo2</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">Sine</span></a><span class="p">(</span><span class="n">freq</span><span class="o">=</span><span class="mf">0.4</span><span class="p">)</span><span class="o">.</span><span class="n">range</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">8</span><span class="p">)</span>
<span class="c1"># Creates a dynamic bandpass filter applied to the noise source</span>
<span class="n">bp1</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.ButBP" title="pyo.lib.filters.ButBP"><span class="n">ButBP</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">n</span></a><span class="p">,</span> <span class="n">freq</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">lfo1</span></a><span class="p">,</span> <span class="n">q</span><span class="o">=</span><span class="n">lfo2</span><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>

<span class="c1"># The LFO object provides more waveforms than just a sine wave</span>

<span class="c1"># Creates a ramp oscillating +/- 1000 around 12000 (filter's frequency)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.LFO" title="pyo.lib.generators.LFO"><span class="n">lfo3</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.LFO" title="pyo.lib.generators.LFO"><span class="n">LFO</span></a><span class="p">(</span><span class="n">freq</span><span class="o">=</span><span class="mf">0.25</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mi">1000</span><span class="p">,</span> <span class="n">add</span><span class="o">=</span><span class="mi">1200</span><span class="p">)</span>
<span class="c1"># Creates a square oscillating between 4 and 12 (filter's Q)</span>
<span class="n">lfo4</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.LFO" title="pyo.lib.generators.LFO"><span class="n">LFO</span></a><span class="p">(</span><span class="n">freq</span><span class="o">=</span><span class="mi">4</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span><span class="o">.</span><span class="n">range</span><span class="p">(</span><span class="mi">4</span><span class="p">,</span> <span class="mi">12</span><span class="p">)</span>
<span class="c1"># Creates a second dynamic bandpass filter applied to the noise source</span>
<span class="n">bp2</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.ButBP" title="pyo.lib.filters.ButBP"><span class="n">ButBP</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">n</span></a><span class="p">,</span> <span class="n">freq</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.LFO" title="pyo.lib.generators.LFO"><span class="n">lfo3</span></a><span class="p">,</span> <span class="n">q</span><span class="o">=</span><span class="n">lfo4</span><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>

<span class="n">s</span><span class="o">.</span><span class="n">gui</span><span class="p">(</span><span class="nb">locals</span><span class="p">())</span>
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