audio.autoplay = false;
                audio.src = 'Coin.wav';
                audio.preload = 'auto';
+               audio.addEventListener('canplaythrough', eventLogger);
                audio.addEventListener('emptied', eventLogger);
                audio.addEventListener('ended', eventLogger);
                audio.addEventListener('loadstart', eventLogger);
                <button onclick="audio.play()">play</button>
                <button onclick="audio.pause()">pause</button>
                <button onclick="audio.muted = !audio.muted">mute</button>
-               <input type="range" min="0" max="1" step="0.01" onchange="audio.volume = event.target.value" />
+               <input type="range" min="0" max="1" step="0.01" value="1" onchange="audio.volume = event.target.value" />
                <button onclick="audio.loop = !audio.loop">loop</button>
        </div>