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<section id="simple-envelopes-py-asr-and-adsr-envelopes">
<h1>04-simple-envelopes.py - ASR and ADSR envelopes.<a class="headerlink" href="#simple-envelopes-py-asr-and-adsr-envelopes" title="Permalink to this heading">¶</a></h1>
<p>The Fader object is a simple way to setup an Attack/Sustain/Release envelope.
This envelope allows to apply fadein and fadeout on audio streams.</p>
<p>If the <cite>dur</cite> argument of the Fader object is set to 0 (the default), the
object waits for a stop() command before activating the release part of
the envelope. Otherwise, the sum of <cite>fadein</cite> and <cite>fadeout</cite> must be less
than or egal to <cite>dur</cite> and the envelope runs to the end on a play() command.</p>
<p>The Adsr object (Attack/Decay/Sustain/Release) acts exactly like the Fader
object, with a more flexible (and so common) kind of envelope.</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="kn">import</span> <span class="nn">random</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"># Infinite sustain for the global envelope.</span>
<span class="n">globalamp</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Fader" title="pyo.lib.controls.Fader"><span class="n">Fader</span></a><span class="p">(</span><span class="n">fadein</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">fadeout</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">dur</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>

<span class="c1"># Envelope for discrete events, sharp attack, long release.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Adsr" title="pyo.lib.controls.Adsr"><span class="n">env</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Adsr" title="pyo.lib.controls.Adsr"><span class="n">Adsr</span></a><span class="p">(</span><span class="n">attack</span><span class="o">=</span><span class="mf">0.01</span><span class="p">,</span> <span class="n">decay</span><span class="o">=</span><span class="mf">0.1</span><span class="p">,</span> <span class="n">sustain</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">release</span><span class="o">=</span><span class="mf">1.5</span><span class="p">,</span> <span class="n">dur</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="mf">0.5</span><span class="p">)</span>
<span class="c1"># setExp method can be used to create exponential or logarithmic envelope.</span>
<span class="n">env</span><span class="o">.</span><span class="n">setExp</span><span class="p">(</span><span class="mf">0.75</span><span class="p">)</span>

<span class="c1"># Initialize  a simple wave player and apply both envelopes.</span>
<span class="n">sig</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.SuperSaw" title="pyo.lib.generators.SuperSaw"><span class="n">SuperSaw</span></a><span class="p">(</span><span class="n">freq</span><span class="o">=</span><span class="p">[</span><span class="mi">100</span><span class="p">,</span> <span class="mi">101</span><span class="p">],</span> <span class="n">detune</span><span class="o">=</span><span class="mf">0.6</span><span class="p">,</span> <span class="n">bal</span><span class="o">=</span><span class="mf">0.8</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="n">globalamp</span> <span class="o">*</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Adsr" title="pyo.lib.controls.Adsr"><span class="n">env</span></a><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>


<span class="k">def</span> <span class="nf">play_note</span><span class="p">():</span>
    <span class="s2">"Play a new note with random frequency and jitterized envelope."</span>
    <span class="n">freq</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">choice</span><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/functions/conv.html#pyo.midiToHz" title="pyo.midiToHz"><span class="n">midiToHz</span></a><span class="p">([</span><span class="mi">36</span><span class="p">,</span> <span class="mi">38</span><span class="p">,</span> <span class="mi">41</span><span class="p">,</span> <span class="mi">43</span><span class="p">,</span> <span class="mi">45</span><span class="p">]))</span>
    <span class="n">sig</span><span class="o">.</span><span class="n">freq</span> <span class="o">=</span> <span class="p">[</span><span class="n">freq</span><span class="p">,</span> <span class="n">freq</span> <span class="o">*</span> <span class="mf">1.005</span><span class="p">]</span>
    <span class="n">env</span><span class="o">.</span><span class="n">attack</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mf">0.002</span><span class="p">,</span> <span class="mf">0.01</span><span class="p">)</span>
    <span class="n">env</span><span class="o">.</span><span class="n">decay</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">)</span>
    <span class="n">env</span><span class="o">.</span><span class="n">sustain</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mf">0.3</span><span class="p">,</span> <span class="mf">0.6</span><span class="p">)</span>
    <span class="n">env</span><span class="o">.</span><span class="n">release</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mf">0.8</span><span class="p">,</span> <span class="mf">1.4</span><span class="p">)</span>
    <span class="c1"># Start the envelope for the event.</span>
    <span class="n">env</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>


<span class="c1"># Periodically call a function.</span>
<span class="n">pat</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/pattern.html#pyo.Pattern" title="pyo.lib.pattern.Pattern"><span class="n">Pattern</span></a><span class="p">(</span><span class="n">play_note</span><span class="p">,</span> <span class="n">time</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span><span class="o">.</span><span class="n">play</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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