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<section id="random-generators-py-overview-of-some-random-generators-of-pyo">
<h1>06-random-generators.py - Overview of some random generators of pyo.<a class="headerlink" href="#random-generators-py-overview-of-some-random-generators-of-pyo" title="Permalink to this heading">¶</a></h1>
<p>The pyo’s random category contains many objects that can be used
for different purposes. This category really deserves to be studied.</p>
<p>In this tutorial, we use three random objects (Choice, Randi, RandInt)
to control the pitches, the amplitude and the tone of a simple synth.</p>
<p>We will come back to random generators when we will talk about musical
algorithms.</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"># Two streams of midi pitches chosen randomly in a predefined list.</span>
<span class="c1"># The argument `choice` of Choice object can be a list of lists to</span>
<span class="c1"># list-expansion.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/randoms.html#pyo.Choice" title="pyo.lib.randoms.Choice"><span class="n">mid</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/randoms.html#pyo.Choice" title="pyo.lib.randoms.Choice"><span class="n">Choice</span></a><span class="p">(</span><span class="n">choice</span><span class="o">=</span><span class="p">[</span><span class="mi">60</span><span class="p">,</span> <span class="mi">62</span><span class="p">,</span> <span class="mi">63</span><span class="p">,</span> <span class="mi">65</span><span class="p">,</span> <span class="mi">67</span><span class="p">,</span> <span class="mi">69</span><span class="p">,</span> <span class="mi">71</span><span class="p">,</span> <span class="mi">72</span><span class="p">],</span> <span class="n">freq</span><span class="o">=</span><span class="p">[</span><span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">])</span>
<span class="c1"># Two small jitters applied on frequency streams.</span>
<span class="c1"># Randi interpolates between old and new values.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/randoms.html#pyo.Randi" title="pyo.lib.randoms.Randi"><span class="n">jit</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/randoms.html#pyo.Randi" title="pyo.lib.randoms.Randi"><span class="n">Randi</span></a><span class="p">(</span><span class="nb">min</span><span class="o">=</span><span class="mf">0.993</span><span class="p">,</span> <span class="nb">max</span><span class="o">=</span><span class="mf">1.007</span><span class="p">,</span> <span class="n">freq</span><span class="o">=</span><span class="p">[</span><span class="mf">4.3</span><span class="p">,</span> <span class="mf">3.5</span><span class="p">])</span>
<span class="c1"># Converts midi pitches to frequencies and applies the jitters.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/utils.html#pyo.MToF" title="pyo.lib.utils.MToF"><span class="n">fr</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/utils.html#pyo.MToF" title="pyo.lib.utils.MToF"><span class="n">MToF</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/randoms.html#pyo.Choice" title="pyo.lib.randoms.Choice"><span class="n">mid</span></a><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/randoms.html#pyo.Randi" title="pyo.lib.randoms.Randi"><span class="n">jit</span></a><span class="p">)</span>
<span class="c1"># Chooses a new feedback value, between 0 and 0.15, every 4 seconds.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/randoms.html#pyo.Randi" title="pyo.lib.randoms.Randi"><span class="n">fd</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/randoms.html#pyo.Randi" title="pyo.lib.randoms.Randi"><span class="n">Randi</span></a><span class="p">(</span><span class="nb">min</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="nb">max</span><span class="o">=</span><span class="mf">0.15</span><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="c1"># RandInt generates a pseudo-random integer number between 0 and `max`</span>
<span class="c1"># values at a frequency specified by `freq` parameter. It holds the</span>
<span class="c1"># value until the next generation.</span>
<span class="c1"># Generates an new LFO frequency once per second.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/randoms.html#pyo.RandInt" title="pyo.lib.randoms.RandInt"><span class="n">sp</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/randoms.html#pyo.RandInt" title="pyo.lib.randoms.RandInt"><span class="n">RandInt</span></a><span class="p">(</span><span class="nb">max</span><span class="o">=</span><span class="mi">6</span><span class="p">,</span> <span class="n">freq</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">add</span><span class="o">=</span><span class="mi">8</span><span class="p">)</span>
<span class="c1"># Creates an LFO oscillating between 0 and 0.4.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">amp</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><a class="sphinx-codeautolink-a" href="../../api/classes/randoms.html#pyo.RandInt" title="pyo.lib.randoms.RandInt"><span class="n">sp</span></a><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.2</span><span class="p">,</span> <span class="n">add</span><span class="o">=</span><span class="mf">0.2</span><span class="p">)</span>
<span class="c1"># A simple synth...</span>
<span class="n">a</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.SineLoop" title="pyo.lib.generators.SineLoop"><span class="n">SineLoop</span></a><span class="p">(</span><span class="n">freq</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/utils.html#pyo.MToF" title="pyo.lib.utils.MToF"><span class="n">fr</span></a><span class="p">,</span> <span class="n">feedback</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/randoms.html#pyo.Randi" title="pyo.lib.randoms.Randi"><span class="n">fd</span></a><span class="p">,</span> <span class="n">mul</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">amp</span></a><span class="p">)</span><span class="o">.</span><span class="n">out</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>
</pre></div>
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