diff --git a/popup.js b/popup.js
index 90ebc2c..37a841e 100644
--- a/popup.js
+++ b/popup.js
@@ -1,24 +1,17 @@
-let audioContext;
-let oscillatorLeft;
-let oscillatorRight;
-let gainNode;
+let audioContext = new (window.AudioContext || window.webkitAudioContext)();
+let oscillatorLeft, oscillatorRight, gainNode;
 let isPlaying = false;
 
-function startBinauralBeats(frequency, delta, volume) {
-    if (audioContext) {
-        audioContext.close();
-    }
-
-    audioContext = new (window.AudioContext || window.webkitAudioContext)();
-
+function startBinauralBeats() {
     oscillatorLeft = audioContext.createOscillator();
     oscillatorRight = audioContext.createOscillator();
     gainNode = audioContext.createGain();
 
-    oscillatorLeft.frequency.setValueAtTime(frequency, audioContext.currentTime);
-    oscillatorRight.frequency.setValueAtTime(frequency + delta, audioContext.currentTime);
+    oscillatorLeft.type = 'sine';
+    oscillatorRight.type = 'sine';
 
-    gainNode.gain.setValueAtTime(volume, audioContext.currentTime);
+    updateFrequencies();
+    updateVolume();
 
     oscillatorLeft.connect(gainNode);
     oscillatorRight.connect(gainNode);
@@ -31,24 +24,29 @@ function startBinauralBeats(frequency, delta, volume) {
 }
 
 function stopBinauralBeats() {
-    if (oscillatorLeft) {
-        oscillatorLeft.stop();
-    }
-    if (oscillatorRight) {
-        oscillatorRight.stop();
-    }
+    oscillatorLeft.stop();
+    oscillatorRight.stop();
     isPlaying = false;
 }
 
+function updateFrequencies() {
+    let frequency = parseFloat(document.getElementById('frequencySlider').value);
+    let delta = parseFloat(document.getElementById('deltaSlider').value);
+    oscillatorLeft.frequency.setValueAtTime(frequency, audioContext.currentTime);
+    oscillatorRight.frequency.setValueAtTime(frequency + delta, audioContext.currentTime);
+}
+
+function updateVolume() {
+    let volume = parseFloat(document.getElementById('volumeSlider').value);
+    gainNode.gain.setValueAtTime(volume, audioContext.currentTime);
+}
+
 document.getElementById('togglePlayPause').addEventListener('click', function() {
     if (isPlaying) {
         stopBinauralBeats();
         this.textContent = 'Play';
     } else {
-        let frequency = Number(document.getElementById('frequencySlider').value);
-        let delta = Number(document.getElementById('deltaSlider').value);
-        let volume = Number(document.getElementById('volumeSlider').value);
-        startBinauralBeats(frequency, delta, volume);
+        startBinauralBeats();
         this.textContent = 'Pause';
     }
 });
@@ -56,22 +54,21 @@ document.getElementById('togglePlayPause').addEventListener('click', function()
 document.getElementById('frequencySlider').addEventListener('input', function() {
     document.getElementById('frequencyDisplay').textContent = `Frequency: ${this.value} Hz`;
     if (isPlaying) {
-        oscillatorLeft.frequency.setValueAtTime(Number(this.value), audioContext.currentTime);
+        updateFrequencies();
     }
 });
 
 document.getElementById('deltaSlider').addEventListener('input', function() {
     document.getElementById('deltaDisplay').textContent = `Delta: ${this.value} Hz`;
     if (isPlaying) {
-        let frequency = Number(document.getElementById('frequencySlider').value);
-        oscillatorRight.frequency.setValueAtTime(frequency + Number(this.value), audioContext.currentTime);
+        updateFrequencies();
     }
 });
 
 document.getElementById('volumeSlider').addEventListener('input', function() {
     document.getElementById('volumeDisplay').textContent = `Volume: ${Math.round(this.value * 100)}%`;
     if (isPlaying) {
-        gainNode.gain.setValueAtTime(Number(this.value), audioContext.currentTime);
+        updateVolume();
     }
 });
 
@@ -86,7 +83,6 @@ document.getElementById('randomize').addEventListener('click', function() {
     document.getElementById('deltaDisplay').textContent = `Delta: ${randomDelta} Hz`;
 
     if (isPlaying) {
-        oscillatorLeft.frequency.setValueAtTime(randomFrequency, audioContext.currentTime);
-        oscillatorRight.frequency.setValueAtTime(randomFrequency + randomDelta, audioContext.currentTime);
+        updateFrequencies();
     }
 });