diff --git a/parcel/lib/audio-manager.js b/parcel/lib/audio-manager.js
index 6641799..4f212f7 100644
--- a/parcel/lib/audio-manager.js
+++ b/parcel/lib/audio-manager.js
@@ -60,7 +60,7 @@ export default class AudioManager{
 
 		/* (7) Initialise coordinator to manage received */
 		this.stack = [];
-		this.stack_save = 0;
+		this.stack_size = 10;
 
 
 
@@ -261,7 +261,11 @@ export default class AudioManager{
 		this.ws.send(buf16);
 
 		/* (6) Read input buffer */
-		this.stack.shift().start(this.ctx.currentTime);
+		this.stack.length > 0 && this.stack.shift().start(this.ctx.currentTime);
+
+		/* (7) Pop stack if exceeded */
+		this.stack.length > this.stack_size && this.stack.pop();
+