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<section id="setting-audio-object-parameter-s-value-with-portamento">
<h1>Setting audio object parameter’s value with portamento<a class="headerlink" href="#setting-audio-object-parameter-s-value-with-portamento" title="Permalink to this heading">¶</a></h1>
<p><strong>03-set-method.py</strong></p>
<p>The set() method of the PyoObject lets the user define a new
value for a given parameter with a portamento time to reach
the target. Optionally, a function to call at the end of the
ramp can be given to the <cite>callback</cite> argument.</p>
<p>The signature of the method is:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">PyoObject</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">attr</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="n">port</span><span class="o">=</span><span class="mf">0.03</span><span class="p">,</span> <span class="n">callback</span><span class="o">=</span><span class="kc">None</span><span class="p">)</span>
</pre></div>
</div>
<p>Where:</p>
<blockquote>
<div><ul class="simple">
<li><p><cite>attr</cite> is the name of the attribute as a string.</p></li>
<li><p><cite>value</cite> is the target value (can be a list if object has
multiple streams).</p></li>
<li><p><cite>port</cite> is the portamento time in seconds.</p></li>
<li><p><cite>callback</cite> is a function to call when the ramp is done.</p></li>
</ul>
</div></blockquote>
<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">from</span> <span class="nn">random</span> <span class="kn">import</span> <span class="n">uniform</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"># 10 frequency modulations with random parameters.</span>
<span class="n">a</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.FM" title="pyo.lib.generators.FM"><span class="n">FM</span></a><span class="p">(</span>
    <span class="n">carrier</span><span class="o">=</span><span class="p">[</span><span class="n">uniform</span><span class="p">(</span><span class="mi">197</span><span class="p">,</span> <span class="mi">203</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)],</span>
    <span class="n">ratio</span><span class="o">=</span><span class="p">[</span><span class="n">uniform</span><span class="p">(</span><span class="mf">0.99</span><span class="p">,</span> <span class="mf">1.01</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)],</span>
    <span class="n">index</span><span class="o">=</span><span class="p">[</span><span class="n">uniform</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span> <span class="mi">10</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)],</span>
    <span class="n">mul</span><span class="o">=</span><span class="mf">0.05</span><span class="p">,</span>
<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">go</span><span class="p">():</span>
    <span class="s2">"Linear ramps between the current values and the new ones in 9.5 sec."</span>
    <span class="c1"># Choose new targets and start the ramps.</span>
    <span class="n">a</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"carrier"</span><span class="p">,</span> <span class="p">[</span><span class="n">uniform</span><span class="p">(</span><span class="mi">395</span><span class="p">,</span> <span class="mi">405</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)],</span> <span class="mf">9.5</span><span class="p">)</span>
    <span class="n">a</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"ratio"</span><span class="p">,</span> <span class="p">[</span><span class="n">uniform</span><span class="p">(</span><span class="mf">0.49</span><span class="p">,</span> <span class="mf">0.51</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)],</span> <span class="mf">9.5</span><span class="p">)</span>
    <span class="c1"># Call the reset() function when portamentos are done.</span>
    <span class="n">a</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"index"</span><span class="p">,</span> <span class="p">[</span><span class="n">uniform</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="mi">15</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)],</span> <span class="mf">9.5</span><span class="p">,</span> <span class="n">callback</span><span class="o">=</span><span class="n">reset</span><span class="p">)</span>


<span class="k">def</span> <span class="nf">reset</span><span class="p">():</span>
    <span class="s2">"Instantaneous jumps to new values."</span>
    <span class="n">a</span><span class="o">.</span><span class="n">carrier</span> <span class="o">=</span> <span class="p">[</span><span class="n">uniform</span><span class="p">(</span><span class="mi">197</span><span class="p">,</span> <span class="mi">203</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)]</span>
    <span class="n">a</span><span class="o">.</span><span class="n">ratio</span> <span class="o">=</span> <span class="p">[</span><span class="n">uniform</span><span class="p">(</span><span class="mf">0.99</span><span class="p">,</span> <span class="mf">1.01</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)]</span>
    <span class="n">a</span><span class="o">.</span><span class="n">index</span> <span class="o">=</span> <span class="p">[</span><span class="n">uniform</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span> <span class="mi">10</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)]</span>


<span class="c1"># Call the go() function every 10 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">go</span><span class="p">,</span> <span class="n">time</span><span class="o">=</span><span class="mi">10</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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