e", 0.1, 0, 1, 0.01) : *;
stereoamp = monoamp, monoamp;

process = stereoamp;

--></faust-editor>
<br>
</div>
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<p>Note that even if the hslider volume appears several times in our code, there will only be one in the user interface:</p>
<h3 id="example-9-vertical-sliders">Example 9: Vertical sliders</h3>
<p>Instead of horizontal sliders, we could use vertical sliders. Just replace <code>hslider(...)</code> with <code>vslider(...)</code>:</p>
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<div class="faust-run"><img 