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<section id="simple-midi-synth-py-create-a-midi-synthesizer-as-a-custom-class">
<h1>04-simple-midi-synth.py - Create a MIDI synthesizer as a custom class.<a class="headerlink" href="#simple-midi-synth-py-create-a-midi-synthesizer-as-a-custom-class" title="Permalink to this heading">¶</a></h1>
<p>A more elaborate MIDI synthesizer built in a custom python class. This
makes easier to use it multiple times. In this example, two objects are
created, one for the played pitch and another playing one octave lower.</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">from</span> <span class="nn">random</span> <span class="kn">import</span> <span class="n">random</span>


<span class="k">class</span> <span class="nc">Synth</span><span class="p">:</span>
    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">transpo</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mi">1</span><span class="p">):</span>
        <span class="c1"># Transposition factor.</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">transpo</span> <span class="o">=</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="n">transpo</span><span class="p">)</span>
        <span class="c1"># Receive midi notes, convert pitch to Hz and manage 10 voices of polyphony.</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">note</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/midi.html#pyo.Notein" title="pyo.lib.midi.Notein"><span class="n">Notein</span></a><span class="p">(</span><span class="n">poly</span><span class="o">=</span><span class="mi">10</span><span class="p">,</span> <span class="n">scale</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">first</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">last</span><span class="o">=</span><span class="mi">127</span><span class="p">)</span>

        <span class="c1"># Handle pitch and velocity (Notein outputs normalized amplitude (0 -&gt; 1)).</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">pit</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">note</span><span class="p">[</span><span class="s2">"pitch"</span><span class="p">]</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">transpo</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">amp</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/midi.html#pyo.MidiAdsr" title="pyo.lib.midi.MidiAdsr"><span class="n">MidiAdsr</span></a><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">note</span><span class="p">[</span><span class="s2">"velocity"</span><span class="p">],</span> <span class="n">attack</span><span class="o">=</span><span class="mf">0.001</span><span class="p">,</span> <span class="n">decay</span><span class="o">=</span><span class="mf">0.1</span><span class="p">,</span> <span class="n">sustain</span><span class="o">=</span><span class="mf">0.7</span><span class="p">,</span> <span class="n">release</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.1</span><span class="p">,)</span>

        <span class="c1"># Anti-aliased stereo square waves, mixed from 10 streams to 1 stream</span>
        <span class="c1"># to avoid channel alternation on new notes.</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">osc1</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.LFO" title="pyo.lib.generators.LFO"><span class="n">LFO</span></a><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">pit</span><span class="p">,</span> <span class="n">sharp</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">amp</span><span class="p">)</span><span class="o">.</span><span class="n">mix</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">osc2</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.LFO" title="pyo.lib.generators.LFO"><span class="n">LFO</span></a><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">pit</span> <span class="o">*</span> <span class="mf">0.997</span><span class="p">,</span> <span class="n">sharp</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">amp</span><span class="p">)</span><span class="o">.</span><span class="n">mix</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>

        <span class="c1"># Stereo mix.</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">mix</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/internals.html#pyo.Mix" title="pyo.lib._core.Mix"><span class="n">Mix</span></a><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">osc1</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">osc2</span><span class="p">],</span> <span class="n">voices</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span>

        <span class="c1"># High frequencies damping.</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">damp</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.ButLP" title="pyo.lib.filters.ButLP"><span class="n">ButLP</span></a><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mix</span><span class="p">,</span> <span class="n">freq</span><span class="o">=</span><span class="mi">5000</span><span class="p">)</span>

        <span class="c1"># Moving notches, using two out-of-phase sine wave oscillators.</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">lfo</span> <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="mf">0.2</span><span class="p">,</span> <span class="n">phase</span><span class="o">=</span><span class="p">[</span><span class="n">random</span><span class="p">(),</span> <span class="n">random</span><span class="p">()])</span><span class="o">.</span><span class="n">range</span><span class="p">(</span><span class="mi">250</span><span class="p">,</span> <span class="mi">4000</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">notch</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.ButBR" title="pyo.lib.filters.ButBR"><span class="n">ButBR</span></a><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">damp</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">lfo</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="n">mul</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">out</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="s2">"Sends the synth's signal to the audio output and return the object itself."</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">notch</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>
        <span class="k">return</span> <span class="bp">self</span>

    <span class="k">def</span> <span class="nf">sig</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="s2">"Returns the synth's signal for future processing."</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">notch</span>


<a class="sphinx-codeautolink-a" href="../../api/classes/server.html#pyo.Server" title="pyo.lib.server.Server"><span class="n">s</span></a> <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">s</span><span class="o">.</span><span class="n">setMidiInputDevice</span><span class="p">(</span><span class="mi">99</span><span class="p">)</span>  <span class="c1"># Open all input devices.</span>
<span class="n">s</span><span class="o">.</span><span class="n">boot</span><span class="p">()</span>

<span class="c1"># Create the midi synth.</span>
<span class="n">a1</span> <span class="o">=</span> <span class="n">Synth</span><span class="p">()</span>

<span class="c1"># Send the synth's signal into a reverb processor.</span>
<span class="n">rev</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.STRev" title="pyo.lib.effects.STRev"><span class="n">STRev</span></a><span class="p">(</span><span class="n">a1</span><span class="o">.</span><span class="n">sig</span><span class="p">(),</span> <span class="n">inpos</span><span class="o">=</span><span class="p">[</span><span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.9</span><span class="p">],</span> <span class="n">revtime</span><span class="o">=</span><span class="mi">2</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">0.15</span><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>

<span class="c1"># It's very easy to double the synth sound!</span>
<span class="c1"># One octave lower and directly sent to the audio output.</span>
<span class="n">a2</span> <span class="o">=</span> <span class="n">Synth</span><span class="p">(</span><span class="n">transpo</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.7</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>
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