 by default and 1 when it is checked. As we want to multiply the signal by 0 when the checkbox is checked we will use <code>1-checkbox("mute")</code>:</p>
<!-- faust-run -->
<div class="faust-run"><img src="exfaust11/exfaust11.svg" class="mx-auto d-block">
<faust-editor><!--

mute = *(1-checkbox("mute"));
monoamp = *(vslider("volume[style:knob]", 0.1, 0, 1, 0.01)) : mute;
stereoamp = monoamp, monoamp;

process = stereoamp;

--></faust-editor>
<br>
</div>
<!-- /faust-run -->

<h3 id="example-13-vertical-and-