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<section id="how-to-send-multiple-outputs-from-a-single-expression">
<h1>How to send multiple outputs from a single expression<a class="headerlink" href="#how-to-send-multiple-outputs-from-a-single-expression" title="Permalink to this heading">¶</a></h1>
<p><strong>09-multiple-outputs.py</strong></p>
<p>If the object generates only one channel output (the default), the last
expression in the script is the output signal. Otherwise, output signals
must be created with the <cite>out</cite> function.</p>
<p>Here is an example of a script that output four sine waves to four
different output channels.</p>
<div class="highlight-scheme notranslate"><div class="highlight"><pre><span></span><span class="p">(</span><span class="k">define</span><span class="w"> </span><span class="nv">osc</span><span class="w"> </span><span class="p">(</span><span class="nb">sin</span><span class="w"> </span><span class="p">(</span><span class="nb">*</span><span class="w"> </span><span class="nv">twopi</span><span class="w"> </span><span class="p">(</span><span class="nf">~</span><span class="w"> </span><span class="nv">$1</span><span class="p">))))</span><span class="w"></span>
<span class="p">(</span><span class="nf">out</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="p">(</span><span class="nb">*</span><span class="w"> </span><span class="p">(</span><span class="nf">osc</span><span class="w"> </span><span class="mi">250</span><span class="p">)</span><span class="w"> </span><span class="mf">0.2</span><span class="p">))</span><span class="w"></span>
<span class="p">(</span><span class="nf">out</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="p">(</span><span class="nb">*</span><span class="w"> </span><span class="p">(</span><span class="nf">osc</span><span class="w"> </span><span class="mi">500</span><span class="p">)</span><span class="w"> </span><span class="mf">0.2</span><span class="p">))</span><span class="w"></span>
<span class="p">(</span><span class="nf">out</span><span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="p">(</span><span class="nb">*</span><span class="w"> </span><span class="p">(</span><span class="nf">osc</span><span class="w"> </span><span class="mi">750</span><span class="p">)</span><span class="w"> </span><span class="mf">0.2</span><span class="p">))</span><span class="w"></span>
<span class="p">(</span><span class="nf">out</span><span class="w"> </span><span class="mi">3</span><span class="w"> </span><span class="p">(</span><span class="nb">*</span><span class="w"> </span><span class="p">(</span><span class="nf">osc</span><span class="w"> </span><span class="mi">1000</span><span class="p">)</span><span class="w"> </span><span class="mf">0.2</span><span class="p">))</span><span class="w"></span>
</pre></div>
</div>
<p>We retrieve the different channels from the Expr object with the
bracket syntax (obj[0] is the first channel, obj[1] the second,
and so on…).</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="n">expression</span> <span class="o">=</span> <span class="s2">"""// Lorenz strange attractor.</span>
<span class="s2">// Control variables</span>
<span class="s2">(let #pit 500) // 1.0 -> 750.0</span>
<span class="s2">(let #chaos 2.0) // 0.5 -> 3.0</span>
<span class="s2">// Initial constants</span>
<span class="s2">(let #A 10.0)</span>
<span class="s2">(let #B 28.0)</span>
<span class="s2">// Computes the differential variables</span>
<span class="s2">(let #delta (* (/ 1.0 sr) #pit))</span>
<span class="s2">(let #vDX (* (- $y1[-1] $y0[-1]) #A))</span>
<span class="s2">(let #vDY (- (* $y0[-1] (- #B $y2[-1])) $y1[-1]))</span>
<span class="s2">(let #vDZ (- (* $y0[-1] $y1[-1]) (* #chaos $y2[-1])))</span>
<span class="s2">// Three differential equations (the first two are the</span>
<span class="s2">// desired audio signals).</span>
<span class="s2">(out 0 (+ $y0[-1] (* #vDX #delta)))</span>
<span class="s2">(out 1 (+ $y1[-1] (* #vDY #delta)))</span>
<span class="s2">(out 2 (+ $y2[-1] (* #vDZ #delta)))</span>
<span class="s2">"""</span>
<span class="c1"># We must tell the Expr object how many signals to output with the `outs` argument.</span>
<span class="c1"># The `initout` argument sets the initial value og output signals (defaults to 0).</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/controls.html#pyo.Sig" title="pyo.lib._core.Sig"><span class="n">Sig</span></a><span class="p">(</span><span class="mi">0</span><span class="p">),</span> <span class="n">expression</span><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">initout</span><span class="o">=</span><span class="mf">1.0</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="p">[</span><span class="mf">0.044</span><span class="p">,</span> <span class="mf">0.0328</span><span class="p">,</span> <span class="mf">0.0</span><span class="p">])</span>
<span class="n">expr</span><span class="o">.</span><span class="n">editor</span><span class="p">()</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>
<a class="sphinx-codeautolink-a" href="../../api/classes/analysis.html#pyo.Spectrum" title="pyo.lib.analysis.Spectrum"><span class="n">sp</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/analysis.html#pyo.Spectrum" title="pyo.lib.analysis.Spectrum"><span class="n">Spectrum</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="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="n">mul</span><span class="o">=</span><span class="mf">0.3</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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