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<section id="gated-verb-py-gated-reverb-applied-to-a-drum-loop">
<h1>03-gated-verb.py - Gated reverb applied to a drum loop.<a class="headerlink" href="#gated-verb-py-gated-reverb-applied-to-a-drum-loop" title="Permalink to this heading">¶</a></h1>
<p>The gated reverb effect, which was most popular in the 1980s, is made using a
combination of strong reverb and a noise gate. The drum sound passes through
a strong reverb, which is rapidly cut off with a gate driven by the dry 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"># Play the drum lopp..</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">sf</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">SfPlayer</span></a><span class="p">(</span><span class="s2">"../snds/drumloop.wav"</span><span class="p">,</span> <span class="n">loop</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>

<span class="c1"># Use a gate to generate the gain curve that will be applied to the reverb.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/dynamics.html#pyo.Gate" title="pyo.lib.dynamics.Gate"><span class="n">gate</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/dynamics.html#pyo.Gate" title="pyo.lib.dynamics.Gate"><span class="n">Gate</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">sf</span></a><span class="p">,</span> <span class="n">thresh</span><span class="o">=-</span><span class="mi">50</span><span class="p">,</span> <span class="n">risetime</span><span class="o">=</span><span class="mf">0.005</span><span class="p">,</span> <span class="n">falltime</span><span class="o">=</span><span class="mf">0.04</span><span class="p">,</span> <span class="n">lookahead</span><span class="o">=</span><span class="mi">4</span><span class="p">,</span> <span class="n">outputAmp</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>

<span class="c1"># Strong reverb.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Freeverb" title="pyo.lib.effects.Freeverb"><span class="n">rev</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Freeverb" title="pyo.lib.effects.Freeverb"><span class="n">Freeverb</span></a><span class="p">(</span><span class="n">sf</span><span class="o">.</span><span class="n">mix</span><span class="p">(</span><span class="mi">2</span><span class="p">),</span> <span class="n">size</span><span class="o">=</span><span class="mf">0.95</span><span class="p">,</span> <span class="n">damp</span><span class="o">=</span><span class="mf">0.3</span><span class="p">,</span> <span class="n">bal</span><span class="o">=</span><span class="mf">1.0</span><span class="p">)</span>

<span class="c1"># Compress the reverb signal and control its amplitude with the gating signal.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/dynamics.html#pyo.Compress" title="pyo.lib.dynamics.Compress"><span class="n">cmp</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/dynamics.html#pyo.Compress" title="pyo.lib.dynamics.Compress"><span class="n">Compress</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Freeverb" title="pyo.lib.effects.Freeverb"><span class="n">rev</span></a><span class="p">,</span> <span class="n">thresh</span><span class="o">=-</span><span class="mi">12</span><span class="p">,</span> <span class="n">ratio</span><span class="o">=</span><span class="mi">3</span><span class="p">,</span> <span class="n">risetime</span><span class="o">=</span><span class="mf">0.005</span><span class="p">,</span> <span class="n">falltime</span><span class="o">=</span><span class="mf">0.05</span><span class="p">,</span> <span class="n">lookahead</span><span class="o">=</span><span class="mi">4</span><span class="p">,</span> <span class="n">knee</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/dynamics.html#pyo.Gate" title="pyo.lib.dynamics.Gate"><span class="n">gate</span></a><span class="p">,)</span>

<span class="c1"># Balance between the dry and wet (gated-reverb) signals.</span>
<span class="n">output</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/utils.html#pyo.Interp" title="pyo.lib.utils.Interp"><span class="n">Interp</span></a><span class="p">(</span><span class="n">sf</span><span class="o">.</span><span class="n">mix</span><span class="p">(</span><span class="mi">2</span><span class="p">),</span> <a class="sphinx-codeautolink-a" href="../../api/classes/dynamics.html#pyo.Compress" title="pyo.lib.dynamics.Compress"><span class="n">cmp</span></a><span class="p">,</span> <span class="n">interp</span><span class="o">=</span><span class="mf">0.2</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>
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