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<section id="score-calls-py-sequencing-the-function-calls">
<h1>02-score-calls.py - Sequencing the function calls.<a class="headerlink" href="#score-calls-py-sequencing-the-function-calls" title="Permalink to this heading">¶</a></h1>
<p>The Score object takes in input an audio stream containing integers
and any time the integer changes, it calls a function with a generic
name to which the integer is added. This allows the user to build a
sequence of functions and to control how and when each one is called.</p>
<p>This example uses a metronome and a counter to generate a stream of
integers at a specific rate. The called functions change the oscillator
frequencies to produce a chords sequence.</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"># A four-streams oscillator to produce a chord.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.SineLoop" title="pyo.lib.generators.SineLoop"><span class="n">osc</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.SineLoop" title="pyo.lib.generators.SineLoop"><span class="n">SineLoop</span></a><span class="p">(</span><span class="n">freq</span><span class="o">=</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="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">],</span> <span class="n">feedback</span><span class="o">=</span><span class="mf">0.05</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.2</span><span class="p">)</span>
<span class="n">rev</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.WGVerb" title="pyo.lib.effects.WGVerb"><span class="n">WGVerb</span></a><span class="p">(</span><span class="n">osc</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">feedback</span><span class="o">=</span><span class="mf">0.8</span><span class="p">,</span> <span class="n">cutoff</span><span class="o">=</span><span class="mi">4000</span><span class="p">,</span> <span class="n">bal</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="k">def</span> <span class="nf">set_osc_freqs</span><span class="p">(</span><span class="n">notes</span><span class="p">):</span>
    <span class="c1"># PyoObject.set() method allow to change the value of an attribute</span>
    <span class="c1"># with an audio ramp to smooth out the change.</span>
    <span class="n">osc</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">attr</span><span class="o">=</span><span class="s2">"freq"</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/functions/conv.html#pyo.midiToHz" title="pyo.midiToHz"><span class="n">midiToHz</span></a><span class="p">(</span><span class="n">notes</span><span class="p">),</span> <span class="n">port</span><span class="o">=</span><span class="mf">0.005</span><span class="p">)</span>


<span class="c1"># The sequence of functions (some call set_osc_freqs to change the notes).</span>
<span class="k">def</span> <span class="nf">event_0</span><span class="p">():</span>
    <span class="n">set_osc_freqs</span><span class="p">([</span><span class="mi">60</span><span class="p">,</span> <span class="mi">64</span><span class="p">,</span> <span class="mi">67</span><span class="p">,</span> <span class="mi">72</span><span class="p">])</span>


<span class="k">def</span> <span class="nf">event_1</span><span class="p">():</span>
    <span class="k">pass</span>


<span class="k">def</span> <span class="nf">event_2</span><span class="p">():</span>
    <span class="n">set_osc_freqs</span><span class="p">([</span><span class="mi">60</span><span class="p">,</span> <span class="mi">64</span><span class="p">,</span> <span class="mi">67</span><span class="p">,</span> <span class="mi">69</span><span class="p">])</span>


<span class="k">def</span> <span class="nf">event_3</span><span class="p">():</span>
    <span class="k">pass</span>


<span class="k">def</span> <span class="nf">event_4</span><span class="p">():</span>
    <span class="n">set_osc_freqs</span><span class="p">([</span><span class="mi">60</span><span class="p">,</span> <span class="mi">65</span><span class="p">,</span> <span class="mi">69</span><span class="p">,</span> <span class="mi">76</span><span class="p">])</span>


<span class="k">def</span> <span class="nf">event_5</span><span class="p">():</span>
    <span class="k">pass</span>


<span class="k">def</span> <span class="nf">event_6</span><span class="p">():</span>
    <span class="n">set_osc_freqs</span><span class="p">([</span><span class="mi">62</span><span class="p">,</span> <span class="mi">65</span><span class="p">,</span> <span class="mi">69</span><span class="p">,</span> <span class="mi">74</span><span class="p">])</span>


<span class="k">def</span> <span class="nf">event_7</span><span class="p">():</span>
    <span class="n">set_osc_freqs</span><span class="p">([</span><span class="mi">59</span><span class="p">,</span> <span class="mi">65</span><span class="p">,</span> <span class="mi">67</span><span class="p">,</span> <span class="mi">74</span><span class="p">])</span>


<span class="c1"># Integer generator (more about triggers in section 12-triggers)</span>
<span class="n">metro</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/triggers.html#pyo.Metro" title="pyo.lib.triggers.Metro"><span class="n">Metro</span></a><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="o">.</span><span class="n">play</span><span class="p">()</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/triggers.html#pyo.Counter" title="pyo.lib.triggers.Counter"><span class="n">count</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/triggers.html#pyo.Counter" title="pyo.lib.triggers.Counter"><span class="n">Counter</span></a><span class="p">(</span><span class="n">metro</span><span class="p">,</span> <span class="nb">min</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="nb">max</span><span class="o">=</span><span class="mi">8</span><span class="p">)</span>

<span class="c1"># Score calls the function named "event_" + count. (if count is 3,</span>
<span class="c1"># function named "event_3" is called without argument.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/pattern.html#pyo.Score" title="pyo.lib.pattern.Score"><span class="n">score</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/pattern.html#pyo.Score" title="pyo.lib.pattern.Score"><span class="n">Score</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/triggers.html#pyo.Counter" title="pyo.lib.triggers.Counter"><span class="n">count</span></a><span class="p">,</span> <span class="n">fname</span><span class="o">=</span><span class="s2">"event_"</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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