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<section id="using-more-than-one-input-signal-in-a-single-expression">
<h1>Using more than one input signal in a single expression<a class="headerlink" href="#using-more-than-one-input-signal-in-a-single-expression" title="Permalink to this heading">¶</a></h1>
<p><strong>03-multiple-inputs.py</strong></p>
<p>It is possible to give a list of audio signals to the <cite>input</cite>
argument if you need more than one signal in your expression.</p>
<p>You can either pass a list of audio objects (as in the complete
example below) or a single multi-streams object, as in:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sig</span> <span class="o">=</span> <span class="n">Sine</span><span class="p">(</span><span class="n">freq</span><span class="o">=</span><span class="p">[</span><span class="mf">10.7647</span><span class="p">,</span> <span class="mf">10.0000</span><span class="p">,</span> <span class="mf">87.9023</span><span class="p">,</span> <span class="mf">296.4831</span><span class="p">])</span>
<span class="n">ex</span> <span class="o">=</span> <span class="n">Expr</span><span class="p">(</span><span class="n">sig</span><span class="p">,</span> <span class="s2">"(* (* (* $x[0] $x1[0]) $x2[0]) $x3[0])"</span><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>
</pre></div>
</div>
<p>If multiple signals are used, the position in the list must be
given between the <cite>$x</cite> and the sample position <cite>[0]</cite>. So, for the
second audio signal, one would retrieve it with <cite>$x1[0]</cite>. The 0
for the first signal can be ommited, <cite>$x[0]</cite> is the same as <cite>$x0[0]</cite>.</p>
<section id="complete-example">
<h2>Complete example<a class="headerlink" href="#complete-example" title="Permalink to this heading">¶</a></h2>
<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="n">expression</span> <span class="o">=</span> <span class="s2">"""</span>
<span class="s2">// Four signals ring-modulation.</span>
<span class="s2">(* (* (* $x[0] $x1[0]) $x2[0]) $x3[0])</span>
<span class="s2">"""</span>
<span class="c1"># Multiple input signals.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">s1</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><span class="n">freq</span><span class="o">=</span><span class="mf">10.7647</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">s2</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><span class="n">freq</span><span class="o">=</span><span class="mf">10.0</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">s3</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><span class="n">freq</span><span class="o">=</span><span class="mf">87.9023</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">s4</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><span class="n">freq</span><span class="o">=</span><span class="mf">296.4831</span><span class="p">)</span>
<span class="c1"># Create the Expr object and show its expression editor. To</span>
<span class="c1"># re-evaluate the expression hit Ctrl+Enter when the editor</span>
<span class="c1"># has the focus.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/expression.html#pyo.Expr" title="pyo.lib.expression.Expr"><span class="n">expr</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/expression.html#pyo.Expr" title="pyo.lib.expression.Expr"><span class="n">Expr</span></a><span class="p">([</span><a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">s1</span></a><span class="p">,</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">s2</span></a><span class="p">,</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">s3</span></a><span class="p">,</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">s4</span></a><span class="p">],</span> <span class="n">expression</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="n">expr</span><span class="o">.</span><span class="n">editor</span><span class="p">()</span>
<span class="c1"># Shows the generated signal.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/analysis.html#pyo.Scope" title="pyo.lib.analysis.Scope"><span class="n">sc</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/analysis.html#pyo.Scope" title="pyo.lib.analysis.Scope"><span class="n">Scope</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/expression.html#pyo.Expr" title="pyo.lib.expression.Expr"><span class="n">expr</span></a><span class="p">)</span>
<span class="c1"># Converts the mono signal to stereo and sends it to the soundcard.</span>
<span class="n">pan</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/pan.html#pyo.Pan" title="pyo.lib.pan.Pan"><span class="n">Pan</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/expression.html#pyo.Expr" title="pyo.lib.expression.Expr"><span class="n">expr</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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