/span> <span class="n">controller</span><span class="o">.</span><span class="n">show_frame</span><span class="p">(</span><span class="s2">&quot;NewFeature&quot;</span><span class="p">)</span>
<span class="p">)</span>
<span class="n">button</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="n">pady</span><span class="o">=</span><span class="mi">10</span><span class="p">)</span>
</pre></div>
</div>
</li>
</ol>
</section>
<section id="biofeedback-frame">
<h2>Biofeedba