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<li class="toctree-l1"><a class="reference internal" href="../../about.html">About pyo</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../winaudioinspect.html">Configuring the audio output (Windows)</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../perftips.html">Improve performance of pyo programs</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../03-generators/index.html">Synthesis generators</a></li>
<li class="toctree-l2"><a class="reference internal" href="../04-soundfiles/index.html">Playing with soundfiles</a></li>
<li class="toctree-l2"><a class="reference internal" href="../05-envelopes/index.html">Amplitude envelopes</a></li>
<li class="toctree-l2"><a class="reference internal" href="../06-filters/index.html">Filtering</a></li>
<li class="toctree-l2"><a class="reference internal" href="../07-effects/index.html">Creating sound effects</a></li>
<li class="toctree-l2"><a class="reference internal" href="../08-dynamics/index.html">Dynamic range of audio signals</a></li>
<li class="toctree-l2"><a class="reference internal" href="../09-callbacks/index.html">Calling python functions from audio objects</a></li>
<li class="toctree-l2"><a class="reference internal" href="../10-tables/index.html">Using tables</a></li>
<li class="toctree-l2"><a class="reference internal" href="../16-midi/index.html">How to use MIDI with pyo</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../19-multirate/index.html">Multirate audio processing</a></li>
<li class="toctree-l2"><a class="reference internal" href="../20-multicore/index.html">Multicore audio programming</a></li>
<li class="toctree-l2"><a class="reference internal" href="../21-utilities/index.html">Utilities</a></li>
<li class="toctree-l2 current"><a class="reference internal" href="index.html">Events framework</a></li>
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<section id="post-processing-py-accessing-events-s-audio-output-for-post-processing">
<h1>14-post-processing.py - Accessing Events’s audio output for post-processing.<a class="headerlink" href="#post-processing-py-accessing-events-s-audio-output-for-post-processing" title="Permalink to this heading">¶</a></h1>
<p>The Events framework is essentially an audio material generator. The user will
generally want to have access to the result for future treatments, as in passing
through some reverb or delay.</p>
<p>There are two built-in arguments that help the user to configure the audio output
of the Events object.</p>
<ul class="simple">
<li><dl class="simple">
<dt><cite>signal</cite>: A string indicating which attribute of the instrument is its final</dt><dd><p>audio output. The Events objects will automatically sum this attribute
signal from all active instrument instances.</p>
</dd>
</dl>
</li>
<li><dl class="simple">
<dt><cite>outs</cite>: Determine how many channels the Events object output signal will contain.</dt><dd><p>This value should match the number of audio streams produced by the
instrument.</p>
</dd>
</dl>
</li>
</ul>
<p>Once these two arguments are defined, the sig() method returns an audio signal that
is the sum of the active instance output signals.</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"># A simple custom instrument. Note that the out() method is not called!</span>
<span class="k">class</span> <span class="nc">MyInstrument</span><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventInstrument" title="pyo.lib.events.EventInstrument"><span class="n">EventInstrument</span></a><span class="p">):</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">**</span><span class="n">args</span><span class="p">):</span>
<span class="n">EventInstrument</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">**</span><span class="n">args</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">output</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="bp">self</span><span class="o">.</span><span class="n">freq</span><span class="p">,</span> <span class="n">sharp</span><span class="o">=</span><span class="p">[</span><span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.6</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="n">mul</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">env</span><span class="p">)</span>
<span class="c1"># Some notes...</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventScale" title="pyo.lib.events.EventScale"><span class="n">scl</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventScale" title="pyo.lib.events.EventScale"><span class="n">EventScale</span></a><span class="p">(</span><span class="s2">"C"</span><span class="p">,</span> <span class="s2">"aeolian"</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">3</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="c1"># ... then the sequence of events. We are looking for a 2 streams (`outs`)</span>
<span class="c1"># signal in the self.output attribute (`signal`) of the instrument.</span>
<span class="n">e</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.Events" title="pyo.lib.events.Events"><span class="n">Events</span></a><span class="p">(</span>
<span class="n">instr</span><span class="o">=</span><span class="n">MyInstrument</span><span class="p">,</span>
<span class="n">degree</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventSlide" title="pyo.lib.events.EventSlide"><span class="n">EventSlide</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventScale" title="pyo.lib.events.EventScale"><span class="n">scl</span></a><span class="p">,</span> <span class="n">segment</span><span class="o">=</span><span class="mi">3</span><span class="p">,</span> <span class="n">step</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span>
<span class="n">beat</span><span class="o">=</span><span class="mi">1</span> <span class="o">/</span> <span class="mf">4.0</span><span class="p">,</span>
<span class="n">db</span><span class="o">=-</span><span class="mi">12</span><span class="p">,</span>
<span class="n">signal</span><span class="o">=</span><span class="s2">"output"</span><span class="p">,</span>
<span class="n">outs</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span>
<span class="n">attack</span><span class="o">=</span><span class="mf">0.001</span><span class="p">,</span>
<span class="n">decay</span><span class="o">=</span><span class="mf">0.05</span><span class="p">,</span>
<span class="n">sustain</span><span class="o">=</span><span class="mf">0.7</span><span class="p">,</span>
<span class="n">release</span><span class="o">=</span><span class="mf">0.05</span><span class="p">,</span>
<span class="p">)</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>
<span class="c1"># We use the sig() method to add post-processing to the events's sound.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Chorus" title="pyo.lib.effects.Chorus"><span class="n">chorus</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Chorus" title="pyo.lib.effects.Chorus"><span class="n">Chorus</span></a><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">sig</span><span class="p">(),</span> <span class="n">depth</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">feedback</span><span class="o">=</span><span class="mf">0.25</span><span class="p">)</span>
<span class="n">delay</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Delay" title="pyo.lib.effects.Delay"><span class="n">Delay</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Chorus" title="pyo.lib.effects.Chorus"><span class="n">chorus</span></a><span class="p">,</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Delay" title="pyo.lib.effects.Delay"><span class="n">delay</span></a><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">feedback</span><span class="o">=</span><span class="mf">0.5</span><span class="p">)</span>
<span class="n">reverb</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.WGVerb" title="pyo.lib.effects.WGVerb"><span class="n">WGVerb</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Chorus" title="pyo.lib.effects.Chorus"><span class="n">chorus</span></a> <span class="o">+</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Delay" title="pyo.lib.effects.Delay"><span class="n">delay</span></a><span class="p">,</span> <span class="n">feedback</span><span class="o">=</span><span class="mf">0.8</span><span class="p">,</span> <span class="n">cutoff</span><span class="o">=</span><span class="mi">5000</span><span class="p">,</span> <span class="n">bal</span><span class="o">=</span><span class="mf">0.25</span><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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