diff --git a/src/client/audio.ts b/src/client/audio.ts
index 42e01526..5990b1d8 100644
--- a/src/client/audio.ts
+++ b/src/client/audio.ts
@@ -1,12 +1,14 @@
 
 import * as c from "./constants.js"
 
-export const soundPong: HTMLAudioElement[] = [];
+export const soundPongArr: HTMLAudioElement[] = [];
 
 for	(let i = 0; i <= 32; i++) {
-	soundPong.push(new Audio("http://localhost:8080/sound/pong/"+i+".mp3"));
-	soundPong[i].volume = c.soundPongVolume;
+	soundPongArr.push(new Audio("http://localhost:8080/sound/pong/"+i+".mp3"));
+	soundPongArr[i].volume = c.soundPongVolume;
+	soundPongArr[i].muted = c.soundMutedFlag;
 }
 
 export const soundRoblox = new Audio("http://localhost:8080/sound/roblox-oof.mp3");
 soundRoblox.volume = c.soundRobloxVolume;
+soundRoblox.muted = c.soundMutedFlag;
diff --git a/src/client/class/GameArea.ts b/src/client/class/GameArea.ts
index 96e1bfc8..9cd92302 100644
--- a/src/client/class/GameArea.ts
+++ b/src/client/class/GameArea.ts
@@ -5,6 +5,7 @@ class GameArea {
 	keys: string[] = [];
 	handleInputInterval: number = 0;
 	gameLoopInterval: number = 0;
+	drawLoopInterval: number = 0;
 	canvas: HTMLCanvasElement;
 	ctx: CanvasRenderingContext2D;
 	constructor() {
diff --git a/src/client/class/GameComponents.ts b/src/client/class/GameComponents.ts
index c820b260..64a2911c 100644
--- a/src/client/class/GameComponents.ts
+++ b/src/client/class/GameComponents.ts
@@ -1,7 +1,7 @@
 
 import * as c from "../constants.js"
-import {VectorInteger} from "../../shared_js/class/Vector.js";
-import {RectangleClient, RacketClient, BallClient} from "./RectangleClient.js";
+import { VectorInteger } from "../../shared_js/class/Vector.js";
+import { RectangleClient, RacketClient, BallClient } from "./RectangleClient.js";
 
 class GameComponentsForClient {
 	wallTop: RectangleClient;
diff --git a/src/client/class/GameComponentsClient.ts b/src/client/class/GameComponentsClient.ts
index 0826554b..6c9f154c 100644
--- a/src/client/class/GameComponentsClient.ts
+++ b/src/client/class/GameComponentsClient.ts
@@ -1,9 +1,9 @@
 
 import * as c from "../constants.js"
-import {Vector, VectorInteger} from "../../shared_js/class/Vector.js";
-import {TextElem, TextNumericValue} from "./Text.js";
-import { GameComponentsForClient } from "./GameComponents.js";
+import { Vector, VectorInteger } from "../../shared_js/class/Vector.js";
+import { TextElem, TextNumericValue } from "./Text.js";
 import { RectangleClient, Line } from "./RectangleClient.js";
+import { GameComponentsForClient } from "./GameComponents.js";
 
 class GameComponentsClient extends GameComponentsForClient {
 	midLine: Line;
diff --git a/src/client/class/InputHistory.ts b/src/client/class/InputHistory.ts
new file mode 100644
index 00000000..cb7e8644
--- /dev/null
+++ b/src/client/class/InputHistory.ts
@@ -0,0 +1,15 @@
+
+import * as en from "../../shared_js/enums.js"
+
+class InputHistory {
+	input: en.InputEnum;
+	inputId: number;
+	deltaTime: number;
+	constructor(input: en.InputEnum, inputId: number, deltaTime: number) {
+		this.input = input;
+		this.inputId = inputId;
+		this.deltaTime = deltaTime;
+	}
+}
+
+export {InputHistory}
diff --git a/src/client/class/RectangleClient.ts b/src/client/class/RectangleClient.ts
index ad5b3da4..da2e9396 100644
--- a/src/client/class/RectangleClient.ts
+++ b/src/client/class/RectangleClient.ts
@@ -1,8 +1,8 @@
 
-import {Vector, VectorInteger} from "../../shared_js/class/Vector.js";
-import {Component, GraphicComponent, Moving} from "../../shared_js/class/interface.js";
+import { Vector, VectorInteger } from "../../shared_js/class/Vector.js";
+import { Component, GraphicComponent, Moving } from "../../shared_js/class/interface.js";
 import { Rectangle, MovingRectangle, Racket, Ball } from "../../shared_js/class/Rectangle.js";
-import {soundPong, soundRoblox} from "../audio.js"
+import { soundPongArr } from "../audio.js"
 import { random } from "../utils.js";
 
 function updateRectangle(this: RectangleClient) {
@@ -91,7 +91,7 @@ class BallClient extends Ball implements GraphicComponent {
 	}
 	bounce(collider?: Rectangle) {
 		this._bounceAlgo(collider);
-		soundPong[ Math.floor(random(0, soundPong.length)) ].play();
+		soundPongArr[ Math.floor(random(0, soundPongArr.length)) ].play();
 	}
 	/* protected _bouncePlayer(collider: Racket) {
 		this._bouncePlayerAlgo(collider);
diff --git a/src/client/class/Text.ts b/src/client/class/Text.ts
index e6ac3708..114992e7 100644
--- a/src/client/class/Text.ts
+++ b/src/client/class/Text.ts
@@ -1,6 +1,6 @@
 
-import {Vector, VectorInteger} from "../../shared_js/class/Vector.js";
-import {Component, Moving} from "../../shared_js/class/interface.js";
+import { Vector, VectorInteger } from "../../shared_js/class/Vector.js";
+import { Component } from "../../shared_js/class/interface.js";
 
 // conflict with Text
 class TextElem implements Component {
diff --git a/src/client/constants.ts b/src/client/constants.ts
index ae6ecb66..940cfce2 100644
--- a/src/client/constants.ts
+++ b/src/client/constants.ts
@@ -1,5 +1,5 @@
 
-import {w} from "../shared_js/constants.js"
+import { w } from "../shared_js/constants.js"
 export * from "../shared_js/constants.js"
 
 export	const midLineSize = Math.floor(w/150);
@@ -9,6 +9,8 @@ export	const gridSize = Math.floor(w/500);
 // min interval on Firefox seems to be 15. Chrome can go lower.
 export	const handleInputIntervalMS = 15; // millisecond
 export	const gameLoopIntervalMS = 15; // millisecond
+export	const drawLoopIntervalMS = 15; // millisecond
 
-export	const soundRobloxVolume = 0; // between 0 and 1
-export	const soundPongVolume = 0; // between 0 and 1
+export	const soundMutedFlag = true;
+export	const soundRobloxVolume = 0.3; // between 0 and 1
+export	const soundPongVolume = 0.3; // between 0 and 1
diff --git a/src/client/draw.ts b/src/client/draw.ts
index 716e5459..11b85b3e 100644
--- a/src/client/draw.ts
+++ b/src/client/draw.ts
@@ -1,7 +1,8 @@
-import {pong, gc, clientInfo} from "./global.js"
-import {gridDisplay} from "./handleInput.js";
 
-function draw()
+import { pong, gc } from "./global.js"
+import { gridDisplay } from "./handleInput.js";
+
+function drawLoop()
 {
 	pong.clear();
 
@@ -10,6 +11,12 @@ function draw()
 	if (gridDisplay) {
 		drawGrid();
 	}
+
+	drawDynamic();
+}
+
+function drawDynamic()
+{
 	gc.scoreLeft.update();
 	gc.scoreRight.update();
 	gc.playerLeft.update();
@@ -35,4 +42,4 @@ function drawGrid()
 	gc.h_grid_d1.update();
 }
 
-export {draw, drawStatic, drawGrid}
+export {drawLoop}
diff --git a/src/client/gameLoop.ts b/src/client/gameLoop.ts
index 4e069d5f..b8c7cafd 100644
--- a/src/client/gameLoop.ts
+++ b/src/client/gameLoop.ts
@@ -1,5 +1,5 @@
-import {gc} from "./global.js";
-import * as d from "./draw.js";
+
+import { gc } from "./global.js";
 
 let actual_time: number = Date.now();
 let last_time: number;
@@ -18,8 +18,6 @@ function gameLoop()
 
 	// client prediction
 	gc.ball.moveAndBounce(delta_time, [gc.wallTop, gc.wallBottom, gc.playerLeft, gc.playerRight]);
-	
-	d.draw();
 }
 
 export {gameLoop}
diff --git a/src/client/global.ts b/src/client/global.ts
index eeea8765..70564ece 100644
--- a/src/client/global.ts
+++ b/src/client/global.ts
@@ -1,3 +1,3 @@
 
 export {pong, gc} from "./pong.js"
-export {clientInfo} from "./ws.js"
+export {socket, clientInfo} from "./ws.js"
diff --git a/src/client/handleInput.ts b/src/client/handleInput.ts
index 0bee1aef..db7e14ee 100644
--- a/src/client/handleInput.ts
+++ b/src/client/handleInput.ts
@@ -1,8 +1,8 @@
-import {pong, gc, clientInfo} from "./global.js"
-import * as d from "./draw.js";
-import { socket } from "./ws.js";
+
+import { pong, gc, socket, clientInfo } from "./global.js"
 import * as ev from "../shared_js/class/Event.js"
 import * as en from "../shared_js/enums.js"
+import { InputHistory }  from "./class/InputHistory.js"
 
 export let gridDisplay = false;
 
@@ -10,17 +10,6 @@ let actual_time: number = Date.now();
 let last_time: number;
 let delta_time: number;
 
-class InputHistory {
-	input: en.InputEnum;
-	inputId: number;
-	deltaTime: number;
-	constructor(input: en.InputEnum, inputId: number, deltaTime: number) {
-		this.input = input;
-		this.inputId = inputId;
-		this.deltaTime = deltaTime;
-	}
-}
-
 const inputHistoryArr: InputHistory[] = [];
 let id = 0;
 /* idMax should be high enough to prevent duplicate "id" in "inputHistoryArr".
@@ -29,28 +18,25 @@ const idMax = 999; // 999 arbitrary
 
 function handleInput()
 {
-	console.log("handleInput");
 	last_time = actual_time;
 	actual_time = Date.now();
 	delta_time = (actual_time - last_time) / 1000;
+
+	const keys = pong.keys;
+	if (keys.length == 0) {
+		return;
+	}
+	// console.log("handleInput");
 	if (id > idMax) {
 		id = 0;
 	}
 
-	var keys = pong.keys;
-	if (keys.length == 0)
-		return;
-
 	if (keys.indexOf("g") != -1)
 	{
-		if (gridDisplay)
-		{
-			pong.clear();
-			d.drawStatic();
-		}
 		gridDisplay = !gridDisplay;
 		pong.deleteKey("g");
 	}
+
 	playerMove(delta_time, keys);
 }
 
@@ -96,15 +82,8 @@ function repeatInput(lastInputId: number)
 		return false;
 	});
 
-	// console.log("repeatInput, lastInputId = " + lastInputId);
-	// console.log("repeatInput, before splice up to index " + i);
-	// console.log(inputHistoryArr);
-	
 	inputHistoryArr.splice(0, i+1);
 	
-	// console.log("repeatInput, after splice");
-	// console.log(inputHistoryArr);
-
 	inputHistoryArr.forEach((value: InputHistory) => {
 		playerMovePrediction(value.deltaTime, value.input);
 	});
diff --git a/src/client/pong.ts b/src/client/pong.ts
index b3e76040..016d387a 100644
--- a/src/client/pong.ts
+++ b/src/client/pong.ts
@@ -1,13 +1,13 @@
 
-import {GameArea} from "./class/GameArea.js";
-import * as d from "./draw.js";
-import {gameLoop} from "./gameLoop.js"
 import * as c from "./constants.js"
+import { GameArea } from "./class/GameArea.js";
 import { GameComponentsClient } from "./class/GameComponentsClient.js";
-import {countdown} from "./utils.js";
-import {handleInput} from "./handleInput.js";
+import { handleInput } from "./handleInput.js";
+import { gameLoop } from "./gameLoop.js"
+import { drawLoop } from "./draw.js";
+import { countdown } from "./utils.js";
 
-import {socket} from "./ws.js"; socket; // no-op
+import {socket} from "./ws.js"; socket; // no-op, just for loading
 
 /* Keys
 	Racket: W/S OR Up/Down
@@ -41,6 +41,7 @@ function resumeGame()
 	});
 	pong.handleInputInterval = window.setInterval(handleInput, c.handleInputIntervalMS);
 	pong.gameLoopInterval = window.setInterval(gameLoop, c.gameLoopIntervalMS);
+	pong.gameLoopInterval = window.setInterval(drawLoop, c.drawLoopIntervalMS);
 }
 
 
diff --git a/src/client/ws.ts b/src/client/ws.ts
index 4fe1019a..28e2d6a1 100644
--- a/src/client/ws.ts
+++ b/src/client/ws.ts
@@ -1,17 +1,17 @@
 
-import {pong, gc} from "./global.js"
-import * as ev from "../shared_js/class/Event.js"
-import {matchmaking, matchmakingComplete, startGame} from "./pong.js";
-import * as en from "../shared_js/enums.js"
-import { RacketClient } from "./class/RectangleClient.js";
-import { sleep } from "./utils.js";
 import * as c from "./constants.js"
-import {soundRoblox} from "./audio.js"
+import { gc } from "./global.js"
+import * as ev from "../shared_js/class/Event.js"
+import * as en from "../shared_js/enums.js"
+import { matchmaking, matchmakingComplete, startGame } from "./pong.js";
+import { RacketClient } from "./class/RectangleClient.js";
 import { repeatInput } from "./handleInput.js";
+import { soundRoblox } from "./audio.js"
+import { sleep } from "./utils.js";
 
 const wsPort = 8042;
 const wsUrl = "ws://" + document.location.hostname + ":" + wsPort + "/pong";
-const socket = new WebSocket(wsUrl, "json");
+export const socket = new WebSocket(wsUrl, "json");
 
 class ClientInfo {
 	id = "";
@@ -66,16 +66,13 @@ function inGameListener(event: MessageEvent)
 	const data: ev.ServerEvent = JSON.parse(event.data);
 	switch (data.type) {
 		case en.EventTypes.gameUpdate:
-			console.log("gameUpdate");
 			// setTimeout(gameUpdate, 1000, data as ev.EventGameUpdate); // artificial latency for testing purpose
 			gameUpdate(data as ev.EventGameUpdate);
 			break;
 		case en.EventTypes.scoreUpdate:
-			console.log("scoreUpdate");
 			scoreUpdate(data as ev.EventScoreUpdate);
 			break;
 		case en.EventTypes.matchEnd:
-			console.log("matchEnd");
 			matchEnd(data as ev.EventMatchEnd);
 			break;
 	}
@@ -83,6 +80,7 @@ function inGameListener(event: MessageEvent)
 
 function gameUpdate(data: ev.EventGameUpdate)
 {
+	console.log("gameUpdate");
 	gc.playerLeft.pos.y = Math.floor(data.playerLeft.y);
 	gc.playerRight.pos.y = Math.floor(data.playerRight.y);
 	gc.ball.pos.x = Math.floor(data.ball.x);
@@ -94,6 +92,7 @@ function gameUpdate(data: ev.EventGameUpdate)
 
 function scoreUpdate(data: ev.EventScoreUpdate)
 {
+	console.log("scoreUpdate");
 	if (clientInfo.side === en.PlayerSide.left && data.scoreRight > gc.scoreRight.value) {
 		soundRoblox.play();
 	}
@@ -106,6 +105,7 @@ function scoreUpdate(data: ev.EventScoreUpdate)
 
 function matchEnd(data: ev.EventMatchEnd)
 {
+	console.log("matchEnd");
 	if (data.winner === clientInfo.side) {
 		alert("WIN"); // placeholder TODO draw
 	}
@@ -113,5 +113,3 @@ function matchEnd(data: ev.EventMatchEnd)
 		alert("LOSE"); // placeholder TODO draw
 	}
 }
-
-export {socket}
diff --git a/src/server/class/Client.ts b/src/server/class/Client.ts
index c244e495..00e311a7 100644
--- a/src/server/class/Client.ts
+++ b/src/server/class/Client.ts
@@ -1,6 +1,6 @@
 
-import {WebSocket} from "ws";
-import {Racket} from "../../shared_js/class/Rectangle.js";
+import { WebSocket } from "../wsServer.js";
+import { Racket } from "../../shared_js/class/Rectangle.js";
 import { GameSession } from "./GameSession.js";
 
 class Client {
diff --git a/src/server/class/GameComponentsServer.ts b/src/server/class/GameComponentsServer.ts
index 84b185c4..769c4c3c 100644
--- a/src/server/class/GameComponentsServer.ts
+++ b/src/server/class/GameComponentsServer.ts
@@ -8,16 +8,13 @@ import { GameComponents } from "../../shared_js/class/GameComponents.js";
 // const mockCTX = new CanvasRenderingContext2D();
 
 class GameComponentsServer extends GameComponents {
-	scoreLeft: number;
-	scoreRight: number;
-	ballInPlay: boolean;
+	scoreLeft: number = 0;
+	scoreRight: number = 0;
+	ballInPlay: boolean = false;
 	constructor()
 	{
 		// super(mockCTX);
 		super();
-		this.scoreLeft = 0;
-		this.scoreRight = 0;
-		this.ballInPlay = false;
 	}
 }
 
diff --git a/src/server/class/GameSession.ts b/src/server/class/GameSession.ts
index 317412a9..cfe0c4c0 100644
--- a/src/server/class/GameSession.ts
+++ b/src/server/class/GameSession.ts
@@ -1,11 +1,11 @@
-import { ClientPlayer } from "./Client";
-import { GameComponents } from "../../shared_js/class/GameComponents.js";
-import { clientInputListener } from "../wsServer.js";
-import * as c from "../constants.js"
-import { GameComponentsServer } from "./GameComponentsServer.js";
-import { random } from "../../shared_js/utils.js";
+
 import * as en from "../../shared_js/enums.js"
 import * as ev from "../../shared_js/class/Event.js"
+import * as c from "../constants.js"
+import { ClientPlayer } from "./Client";
+import { GameComponentsServer } from "./GameComponentsServer.js";
+import { clientInputListener } from "../wsServer.js";
+import { random } from "../../shared_js/utils.js";
 
 /*
 	Arg "s: GameSession" replace "this: GameSession" for use with setTimeout(),
diff --git a/src/server/server.ts b/src/server/server.ts
index aa129cdb..09b6c459 100644
--- a/src/server/server.ts
+++ b/src/server/server.ts
@@ -4,17 +4,16 @@ import url from "url";
 import fs from "fs";
 import path from "path";
 
-import {wsServer} from "./wsServer.js"; wsServer; // no-op
+import {wsServer} from "./wsServer.js"; wsServer; // no-op, just for loading
 
 const hostname = "localhost";
 const port = 8080;
 const root = "../../www/";
 
 const server = http.createServer((req, res) => {
-	// var q = new URL(req.url, `http://${req.getHeaders().host}`)
-	// @ts-ignore
-	var q = url.parse(req.url, true);
-	var filename = root + q.pathname;
+	// let q = new URL(req.url, `http://${req.getHeaders().host}`)
+	let q = url.parse(req.url, true);
+	let filename = root + q.pathname;
 	fs.readFile(filename, (err, data) => {
 		if (err) {
 			res.writeHead(404, {"Content-Type": "text/html"});
diff --git a/src/server/wsServer.ts b/src/server/wsServer.ts
index 922979ae..124a5d7e 100644
--- a/src/server/wsServer.ts
+++ b/src/server/wsServer.ts
@@ -1,7 +1,7 @@
 
 import { WebSocketServer, WebSocket as BaseLibWebSocket } from "ws";
 
-class WebSocket extends BaseLibWebSocket {
+export class WebSocket extends BaseLibWebSocket {
 	id?: string;
 }
 
@@ -10,8 +10,8 @@ import { v4 as uuidv4 } from 'uuid';
 
 import * as en from "../shared_js/enums.js"
 import * as ev from "../shared_js/class/Event.js"
-import {Client, ClientPlayer} from "./class/Client.js"
-import {GameSession} from "./class/GameSession.js"
+import { Client, ClientPlayer } from "./class/Client.js"
+import { GameSession } from "./class/GameSession.js"
 
 // pas indispensable d'avoir un autre port si le WebSocket est relié à un serveur http préexistant ?
 const wsPort = 8042;
@@ -61,8 +61,8 @@ function clientAnnounceListener(this: WebSocket, data: string)
 			// TODO: reconnection with msg.id ?
 			// TODO: spectator/player distinction with msg.type ?
 
-			this.send(JSON.stringify( new ev.EventAssignId(this.id) ))
-			this.send(JSON.stringify( new ev.ServerEvent(en.EventTypes.matchmakingInProgress) ))
+			this.send(JSON.stringify( new ev.EventAssignId(this.id) ));
+			this.send(JSON.stringify( new ev.ServerEvent(en.EventTypes.matchmakingInProgress) ));
 			matchmaking(this);
 		}
 		else {
@@ -110,7 +110,7 @@ function matchmaking(socket: WebSocket)
 		});
 		gameSession.playersMap.forEach( (client) => {
 			/* set listener last to be absolutly sure there no early game launch
-			(unlikely, but theoretically possible) */
+			(unlikely, but possible in theory) */
 			client.socket.once("message", playerReadyConfirmationListener);
 		});
 	}
diff --git a/src/shared_js/class/GameComponents.ts b/src/shared_js/class/GameComponents.ts
index 0c9309c2..0ef0a64a 100644
--- a/src/shared_js/class/GameComponents.ts
+++ b/src/shared_js/class/GameComponents.ts
@@ -3,8 +3,8 @@
 	For the moment, this code is only used by the server.
 */
 import * as c from "../constants.js"
-import {VectorInteger} from "./Vector.js";
-import {Rectangle, Racket, Ball} from "./Rectangle.js";
+import { VectorInteger } from "./Vector.js";
+import { Rectangle, Racket, Ball } from "./Rectangle.js";
 
 class GameComponents {
 	wallTop: Rectangle;
diff --git a/src/shared_js/class/Rectangle.ts b/src/shared_js/class/Rectangle.ts
index 35352b70..8ebd6415 100644
--- a/src/shared_js/class/Rectangle.ts
+++ b/src/shared_js/class/Rectangle.ts
@@ -1,6 +1,6 @@
 
-import {Vector, VectorInteger} from "./Vector.js";
-import {Component, Moving} from "./interface.js";
+import { Vector, VectorInteger } from "./Vector.js";
+import { Component, Moving } from "./interface.js";
 
 class Rectangle implements Component {
 	pos: VectorInteger;
diff --git a/src/shared_js/class/interface.ts b/src/shared_js/class/interface.ts
index 5fdb8315..39753de1 100644
--- a/src/shared_js/class/interface.ts
+++ b/src/shared_js/class/interface.ts
@@ -1,5 +1,5 @@
 
-import {Vector, VectorInteger} from "./Vector.js";
+import { Vector, VectorInteger } from "./Vector.js";
 
 interface Component {
 	pos: VectorInteger;