diff --git a/app/lib/LastN.js b/app/lib/LastN.js
deleted file mode 100644
index 99b2e7f..0000000
--- a/app/lib/LastN.js
+++ /dev/null
@@ -1,135 +0,0 @@
-import { EventEmitter } from 'events';
-import Logger from './Logger';
-
-const logger = new Logger('LastN');
-
-export default class LastN extends EventEmitter
-{
-	constructor(lastNCount, room)
-	{
-		super();
-
-		this._room = room;
-		this._lastNCount = lastNCount;
-		this._peerList = [];
-		this._currentLastN = [];
-		this._started = false;
-	}
-
-	start()
-	{
-		const peers = this._room.peers;
-
-		for (const peer of peers)
-		{
-			this._handlePeer(peer);
-		}
-
-		this._handleRoom();
-
-		this._started = true;
-		this._lastNUpdated();
-	}
-
-	peerInLastN(peerName)
-	{
-		if (this._started)
-		{
-			return this._currentLastN.indexOf(peerName) !== -1;
-		}
-		else
-		{
-			return false;
-		}
-	}
-
-	_handleRoom()
-	{
-		this._room.on('newpeer', (peer) =>
-		{
-			logger.debug(
-				'lastN room "newpeer" event [name:"%s", peer:%o]', peer.name, peer);
-			this._handlePeer(peer);
-		});
-	}
-
-	addSpeakerList(speakerList)
-	{
-		this._peerList = [ ...new Set([ ...speakerList, ...this._peerList ]) ];
-
-		if (this._started)
-			this._lastNUpdated();
-	}
-
-	_handlePeer(peer)
-	{
-		logger.debug('_lastN _handlePeer() [peerName:"%s"]', peer.name);
-
-		if (this._peerList.indexOf(peer.name) === -1) // We don't have this peer in the list
-		{
-			peer.on('close', () =>
-			{
-				const index = this._peerList.indexOf(peer.name);
-
-				if (index > -1) // We have this peer in the list, remove
-				{
-					this._peerList.splice(index, 1);
-
-					this._lastNUpdated();
-				}
-			});
-
-			logger.debug('_handlePeer() | adding peer [peerName:"%s"]', peer.name);
-
-			this._peerList.push(peer.name);
-
-			this._lastNUpdated();
-		}
-	}
-
-	handleActiveSpeaker(peerName)
-	{
-		logger.debug('handleActiveSpeaker() [peerName:"%s"]', peerName);
-
-		const index = this._peerList.indexOf(peerName);
-
-		if (index > -1)
-		{
-			this._peerList.splice(index, 1);
-			this._peerList = [ peerName ].concat(this._peerList);
-
-			this._lastNUpdated();
-		}
-	}
-
-	_lastNUpdated()
-	{
-		if (
-			!this._arraysEqual(
-				this._currentLastN, this._peerList.slice(0, this._lastNCount)
-			)
-		)
-		{
-			logger.debug('_lastNUpdated() | lastN is updated, emitting');
-
-			this._currentLastN = this._peerList.slice(0, this._lastNCount);
-			this.emit('lastn-updated', this._currentLastN);
-		}
-		else
-			logger.debug('_lastNUpdated() | lastN not updated');
-	}
-
-	_arraysEqual(arr1, arr2)
-	{
-		if (arr1.length !== arr2.length)
-			return false;
-
-		for (let i = arr1.length; i--;)
-		{
-			if (arr1[i] !== arr2[i])
-				return false;
-		}
-
-		return true;
-	}
-}
diff --git a/app/lib/RoomClient.js b/app/lib/RoomClient.js
index 54f6fa0..c52fe0b 100644
--- a/app/lib/RoomClient.js
+++ b/app/lib/RoomClient.js
@@ -65,6 +65,9 @@ export default class RoomClient
 		// My peer name.
 		this._peerName = peerName;
 
+		// Alert sound
+		this._soundAlert = new Audio('/resources/sounds/notify.mp3');
+
 		// Socket.io peer connection
 		this._signalingSocket = io(signalingUrl);
 
@@ -1112,6 +1115,23 @@ export default class RoomClient
 
 			this._dispatch(
 				stateActions.addResponseMessage({ ...chatMessage, peerName }));
+
+			if (!this._getState().toolarea.toolAreaOpen ||
+				(this._getState().toolarea.toolAreaOpen &&
+				this._getState().toolarea.currentToolTab !== 'chat')) // Make sound
+			{
+				const alertPromise = this._soundAlert.play();
+
+				if (alertPromise !== undefined)
+				{
+					alertPromise
+						.then()
+						.catch((error) =>
+						{
+							logger.error('_soundAlert.play() | failed: %o', error);
+						});
+				}
+			}
 		});
 
 		this._signalingSocket.on('file-receive', (data) =>
@@ -1173,6 +1193,18 @@ export default class RoomClient
 			logger.debug(
 				'room "newpeer" event [name:"%s", peer:%o]', peer.name, peer);
 
+			const alertPromise = this._soundAlert.play();
+
+			if (alertPromise !== undefined)
+			{
+				alertPromise
+					.then()
+					.catch((error) =>
+					{
+						logger.error('_soundAlert.play() | failed: %o', error);
+					});
+			}
+
 			this._handlePeer(peer);
 		});
 
diff --git a/app/resources/sounds/notify.mp3 b/app/resources/sounds/notify.mp3
new file mode 100644
index 0000000..cd09ed5
Binary files /dev/null and b/app/resources/sounds/notify.mp3 differ