se a graphical slider. For that purpose we can use a <code>hslider(...)</code>, a horizontal slider. It takes five parameters. The first one is the name <code>"volume"</code>, then we have the defaut value <code>0.1</code>, the minimun value <code>0</code>, the maximum value <code>1</code> and a step value <code>0.1</code>. So here the default value is <code>0.1</code>:</p>
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process = _, hs