<span id="duration">--:--</span>
                <button onclick="audio.loop = !audio.loop">loop</button>
                <button onclick="audio.playbackRate = -audio.playbackRate">reverse</button>
-               <input id="rate" type="range" min="-1" max="1" step="0.01" value="1" oninput="audio.playbackRate = event.target.value" />
+               <input id="rate" type="range" min="-2" max="2" step="0.01" value="1" oninput="audio.playbackRate = event.target.value" />
        </div>
 
 </body>