diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..f5b79c5cf4 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -59,6 +59,29 @@
 
 <script>
 
+  function playSound(e) {
+    // get audio and key elementss
+    const audio = document.querySelector(`audio[data-key="${e.keyCode}"]`);
+    const key = document.querySelector(`.key[data-key="${e.keyCode}"]`);
+
+    // return if no audio is on key
+    if(!audio) return; // go home when no audio is found
+
+    key.classList.add('playing');
+    audio.currentTime = 0;
+    audio.play();
+  }
+
+  function removeTransition(e) {
+    if(e.propertyName !== 'transform') return; // skip if it is no transform
+    // console.log(e.propertyName);
+    this.classList.remove('playing');
+  }
+
+  const keys = document.querySelectorAll('.key');
+  window.addEventListener('keydown', playSound);
+  keys.forEach(key => key.addEventListener('transitionend', removeTransition));
+
 </script>
 
 
diff --git a/01 - JavaScript Drum Kit/style.css b/01 - JavaScript Drum Kit/style.css
index bfdba84312..d60be26237 100644
--- a/01 - JavaScript Drum Kit/style.css	
+++ b/01 - JavaScript Drum Kit/style.css	
@@ -24,7 +24,7 @@ body,html {
   margin: 1rem;
   font-size: 1.5rem;
   padding: 1rem .5rem;
-  transition: all .07s ease;
+  transition: all 80ms ease;
   width: 10rem;
   text-align: center;
   color: white;