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<section id="mixing-multiple-inputs-to-multiple-outputs-with-fading-time">
<h1>Mixing multiple inputs to multiple outputs with fading time<a class="headerlink" href="#mixing-multiple-inputs-to-multiple-outputs-with-fading-time" title="Permalink to this heading">¶</a></h1>
<p><strong>09-audio-mixer.py</strong></p>
<p>The Mixer object allows to route multiple inputs to multiple outputs
with individual amplitude. A portamento time, defined with the <cite>time</cite>
argument, is applied to amplitude changes to make smooth mixing
variations.</p>
<p>The initialization argument <cite>outs</cite> lets defined the number of available
outputs and the argument <cite>chnls</cite> specifies how many channels per output.
If <cite>chnls</cite> is 2 and a single audio stream is given to an input, the signal
will be dupplicated to fill the two channels of the voice.</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="n">duplex</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span><span class="o">.</span><span class="n">boot</span><span class="p">()</span>
<span class="c1"># Define some input signals for the mixer.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">low</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/flute.aif"</span><span class="p">,</span> <span class="n">speed</span><span class="o">=</span><span class="mf">0.5</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="n">mul</span><span class="o">=</span><span class="mf">0.3</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">mid</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/flute.aif"</span><span class="p">,</span> <span class="n">speed</span><span class="o">=</span><span class="mf">0.75</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="n">mul</span><span class="o">=</span><span class="mf">0.3</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">hig</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/flute.aif"</span><span class="p">,</span> <span class="n">speed</span><span class="o">=</span><span class="mf">1.0</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="n">mul</span><span class="o">=</span><span class="mf">0.3</span><span class="p">)</span>
<span class="c1"># Mixer with 3 outputs, 2 channels per voice and 0.5 second of amplitude fading time.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/pan.html#pyo.Mixer" title="pyo.lib.pan.Mixer"><span class="n">mm</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/pan.html#pyo.Mixer" title="pyo.lib.pan.Mixer"><span class="n">Mixer</span></a><span class="p">(</span><span class="n">outs</span><span class="o">=</span><span class="mi">3</span><span class="p">,</span> <span class="n">chnls</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">time</span><span class="o">=</span><span class="mf">0.5</span><span class="p">)</span>
<span class="c1"># Route the mixer's outputs to some effects.</span>
<span class="n">octaveBelow</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Harmonizer" title="pyo.lib.effects.Harmonizer"><span class="n">Harmonizer</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/pan.html#pyo.Mixer" title="pyo.lib.pan.Mixer"><span class="n">mm</span></a><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">transpo</span><span class="o">=-</span><span class="mi">12</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">add</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/pan.html#pyo.Mixer" title="pyo.lib.pan.Mixer"><span class="n">mm</span></a><span class="p">[</span><span class="mi">0</span><span class="p">])</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>
<span class="n">fifthBelow</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Harmonizer" title="pyo.lib.effects.Harmonizer"><span class="n">Harmonizer</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/pan.html#pyo.Mixer" title="pyo.lib.pan.Mixer"><span class="n">mm</span></a><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">transpo</span><span class="o">=-</span><span class="mi">7</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">add</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/pan.html#pyo.Mixer" title="pyo.lib.pan.Mixer"><span class="n">mm</span></a><span class="p">[</span><span class="mi">1</span><span class="p">])</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>
<span class="n">secondAbove</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Harmonizer" title="pyo.lib.effects.Harmonizer"><span class="n">Harmonizer</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/pan.html#pyo.Mixer" title="pyo.lib.pan.Mixer"><span class="n">mm</span></a><span class="p">[</span><span class="mi">2</span><span class="p">],</span> <span class="n">transpo</span><span class="o">=</span><span class="mi">2</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">add</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/pan.html#pyo.Mixer" title="pyo.lib.pan.Mixer"><span class="n">mm</span></a><span class="p">[</span><span class="mi">2</span><span class="p">])</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>
<span class="c1"># Add signals as inputs to the mixer.</span>
<span class="n">mm</span><span class="o">.</span><span class="n">addInput</span><span class="p">(</span><span class="n">voice</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="nb">input</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">low</span></a><span class="p">)</span>
<span class="n">mm</span><span class="o">.</span><span class="n">addInput</span><span class="p">(</span><span class="n">voice</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="nb">input</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">mid</span></a><span class="p">)</span>
<span class="n">mm</span><span class="o">.</span><span class="n">addInput</span><span class="p">(</span><span class="n">voice</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="nb">input</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">hig</span></a><span class="p">)</span>
<span class="c1"># Initial assignment of inputs to outputs with amplitude balance.</span>
<span class="n">mm</span><span class="o">.</span><span class="n">setAmp</span><span class="p">(</span><span class="n">vin</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">vout</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">amp</span><span class="o">=</span><span class="mf">0.25</span><span class="p">)</span>
<span class="n">mm</span><span class="o">.</span><span class="n">setAmp</span><span class="p">(</span><span class="n">vin</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">vout</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">amp</span><span class="o">=</span><span class="mf">0.25</span><span class="p">)</span>
<span class="c1"># Dictionaries used to print assigment messages.</span>
<span class="n">inputs</span> <span class="o">=</span> <span class="p">{</span><span class="mi">0</span><span class="p">:</span> <span class="s2">"low"</span><span class="p">,</span> <span class="mi">1</span><span class="p">:</span> <span class="s2">"mid"</span><span class="p">,</span> <span class="mi">2</span><span class="p">:</span> <span class="s2">"hig"</span><span class="p">}</span>
<span class="n">outputs</span> <span class="o">=</span> <span class="p">{</span><span class="mi">0</span><span class="p">:</span> <span class="s2">"Octave below"</span><span class="p">,</span> <span class="mi">1</span><span class="p">:</span> <span class="s2">"Fifth below"</span><span class="p">,</span> <span class="mi">2</span><span class="p">:</span> <span class="s2">"Second above"</span><span class="p">}</span>
<span class="c1"># Dynamic assignation of inputs to outputs with random amplitude.</span>
<span class="k">def</span> <span class="nf">assign</span><span class="p">():</span>
<span class="n">vin</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">randint</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="n">vout</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">randint</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="n">amp</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">choice</span><span class="p">([</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mf">0.25</span><span class="p">,</span> <span class="mf">0.33</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">])</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"</span><span class="si">%s</span><span class="s2"> -> </span><span class="si">%s</span><span class="s2">, amp = </span><span class="si">%f</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">inputs</span><span class="p">[</span><span class="n">vin</span><span class="p">],</span> <span class="n">outputs</span><span class="p">[</span><span class="n">vout</span><span class="p">],</span> <span class="n">amp</span><span class="p">))</span>
<span class="n">mm</span><span class="o">.</span><span class="n">setAmp</span><span class="p">(</span><span class="n">vin</span><span class="o">=</span><span class="n">vin</span><span class="p">,</span> <span class="n">vout</span><span class="o">=</span><span class="n">vout</span><span class="p">,</span> <span class="n">amp</span><span class="o">=</span><span class="n">amp</span><span class="p">)</span>
<span class="c1"># Call a new assignment every 3 seconds.</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">function</span><span class="o">=</span><span class="n">assign</span><span class="p">,</span> <span class="n">time</span><span class="o">=</span><span class="mi">3</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>
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