diff --git a/index.html b/index.html
index cdde3012..abac3cbc 100644
--- a/index.html
+++ b/index.html
@@ -56,6 +56,12 @@ let log = msg => {
   document.getElementById('div').innerHTML += msg + '<br>'
 }
 
+
+const dataChannelOptions = {
+  ordered: false, // do not guarantee order
+  maxPacketLifeTime: 3000, // in milliseconds
+};
+
 let inputChannel = pc.createDataChannel('foo')
 inputChannel.onclose = () => console.log('inputChannel has closed')
 inputChannel.onopen = () => console.log('inputChannel has opened')
@@ -81,14 +87,46 @@ pc.onicecandidate = event => {
 
 pc.createOffer({offerToReceiveVideo: true, offerToReceiveAudio: true}).then(d => pc.setLocalDescription(d)).catch(log)
 
+
+keyState = {
+  // controllers
+  a: false,
+  b: false, 
+  start: false,
+  select: false,
+  
+  // navigators
+  up: false,
+  down: false,
+  left: false,
+  right: false,
+}
+
+keyMap = {
+  37: "left",
+  38: "up",
+  39: "right",
+  40: "down",
+
+  90: "a",
+  88: "b", 
+  67: "start", 
+  86: "select",
+}
+
 document.body.onkeydown = function(e){
-  inputChannel.send(e.keyCode)
+  if (e.keyCode in keyMap) {
+    keyState[keyMap[e.keyCode]] = true;
+  }
 };
 
 document.body.onkeyup = function(e){
-  inputChannel.send(-e.keyCode)
+  if (e.keyCode in keyMap) {
+    keyState[keyMap[e.keyCode]] = false;
+  }
 };
 
+
 window.startSession = () => {
   let sd = remoteSessionDescription
   if (sd === '') {
@@ -96,9 +134,50 @@ window.startSession = () => {
   }
 
   try {
-    pc.setRemoteDescription(new RTCSessionDescription(JSON.parse(atob(sd))))
+    pc.setRemoteDescription(new RTCSessionDescription(JSON.parse(atob(sd))), 
+
+      // success
+      () => {
+
+        fps = 60; // input frame per second
+
+        setInterval(() => {
+          // prepare key
+          /*
+          const (
+            ButtonA = iota
+            ButtonB
+            ButtonSelect
+            ButtonStart
+            ButtonUp
+            ButtonDown
+            ButtonLeft
+            ButtonRight
+          )
+          */
+          
+          st = "";
+          ["a", "b", "select", "start", "up", "down", "left", "right"].forEach(elem => {
+            st += keyState[elem]?1:0;
+          });
+          ss = parseInt(st, 2);
+          console.log(`Key state string: ${st} ==> ${ss}`);
+
+          // send
+          inputChannel.send(ss);
+
+        }, 1000 / fps)
+
+
+      },
+
+      // error callback      
+      (exp) => {
+        console.log("setRemoteDescription failed, we are doomed");
+        console.log(exp);
+      });
   } catch (e) {
-    alert(e)
+    alert(e);
   }
 }
 
diff --git a/ui/director.go b/ui/director.go
index 88fba3aa..a6feedb6 100644
--- a/ui/director.go
+++ b/ui/director.go
@@ -15,16 +15,17 @@ type View interface {
 }
 
 type Director struct {
-	audio        *Audio
+	// audio        *Audio
 	view         View
 	timestamp    float64
 	imageChannel chan *image.RGBA
 	inputChannel chan int
 }
 
-func NewDirector(audio *Audio, imageChannel chan *image.RGBA, inputChannel chan int) *Director {
+func NewDirector(imageChannel chan *image.RGBA, inputChannel chan int) *Director {
+// func NewDirector(audio *Audio, imageChannel chan *image.RGBA, inputChannel chan int) *Director {
 	director := Director{}
-	director.audio = audio
+	// director.audio = audio
 	director.imageChannel = imageChannel
 	director.inputChannel = inputChannel
 	return &director
diff --git a/ui/gameview.go b/ui/gameview.go
index 5c9d7b75..313b3173 100644
--- a/ui/gameview.go
+++ b/ui/gameview.go
@@ -3,6 +3,9 @@ package ui
 import (
 	"image"
 
+	"fmt"
+	// "strconv"
+
 	"github.com/giongto35/game-online/nes"
 )
 
@@ -16,14 +19,14 @@ type GameView struct {
 	record   bool
 	frames   []image.Image
 
-	keyPressed []bool
+	keyPressed [8]bool
 
 	imageChannel chan *image.RGBA
 	inputChannel chan int
 }
 
 func NewGameView(director *Director, console *nes.Console, title, hash string, imageChannel chan *image.RGBA, inputChannel chan int) View {
-	gameview := &GameView{director, console, title, hash, false, nil, make([]bool, 255), imageChannel, inputChannel}
+	gameview := &GameView{director, console, title, hash, false, nil, [8]bool{false}, imageChannel, inputChannel}
 	go gameview.ListenToInputChannel()
 	return gameview
 }
@@ -31,18 +34,20 @@ func NewGameView(director *Director, console *nes.Console, title, hash string, i
 func (view *GameView) ListenToInputChannel() {
 	for {
 		key := <-view.inputChannel
-		if key < 0 {
-			view.keyPressed[-key] = false
-		} else {
-			view.keyPressed[key] = true
+		s := fmt.Sprintf("%.8b", key)
+		for i := 0; i < len(s); i++ {
+			if s[i] == '1' {
+				view.keyPressed[i] = true
+			} else {
+				view.keyPressed[i] = false
+			}
 		}
-
 	}
 }
 
 func (view *GameView) Enter() {
-	view.console.SetAudioChannel(view.director.audio.channel)
-	view.console.SetAudioSampleRate(view.director.audio.sampleRate)
+	// view.console.SetAudioChannel(view.director.audio.channel)
+	// view.console.SetAudioSampleRate(view.director.audio.sampleRate)
 	// load state
 	if err := view.console.LoadState(savePath(view.hash)); err == nil {
 		return
@@ -59,8 +64,8 @@ func (view *GameView) Enter() {
 }
 
 func (view *GameView) Exit() {
-	view.console.SetAudioChannel(nil)
-	view.console.SetAudioSampleRate(0)
+	// view.console.SetAudioChannel(nil)
+	// view.console.SetAudioSampleRate(0)
 	// save sram
 	cartridge := view.console.Cartridge
 	if cartridge.Battery != 0 {
@@ -87,14 +92,15 @@ func (view *GameView) Update(t, dt float64) {
 
 func (view *GameView) updateControllers() {
 	// TODO: switch case
-	var buttons [8]bool
-	buttons[nes.ButtonLeft] = view.keyPressed[37]
-	buttons[nes.ButtonUp] = view.keyPressed[38]
-	buttons[nes.ButtonRight] = view.keyPressed[39]
-	buttons[nes.ButtonDown] = view.keyPressed[40]
-	buttons[nes.ButtonA] = view.keyPressed[32]
-	buttons[nes.ButtonB] = view.keyPressed[17]
-	buttons[nes.ButtonStart] = view.keyPressed[13]
-	buttons[nes.ButtonSelect] = view.keyPressed[16]
-	view.console.Controller1.SetButtons(buttons)
+	// var buttons [8]bool
+	// buttons[nes.ButtonLeft] = view.keyPressed[37]
+	// buttons[nes.ButtonUp] = view.keyPressed[38]
+	// buttons[nes.ButtonRight] = view.keyPressed[39]
+	// buttons[nes.ButtonDown] = view.keyPressed[40]
+	// buttons[nes.ButtonA] = view.keyPressed[32]
+	// buttons[nes.ButtonB] = view.keyPressed[17]
+	// buttons[nes.ButtonStart] = view.keyPressed[13]
+	// buttons[nes.ButtonSelect] = view.keyPressed[16]
+	// view.console.Controller1.SetButtons(buttons)
+	view.console.Controller1.SetButtons(view.keyPressed)
 }
diff --git a/ui/run.go b/ui/run.go
index 5b5e342b..5822bd28 100644
--- a/ui/run.go
+++ b/ui/run.go
@@ -2,10 +2,10 @@ package ui
 
 import (
 	"image"
-	"log"
+	// "log"
 	"runtime"
 
-	"github.com/gordonklaus/portaudio"
+	// "github.com/gordonklaus/portaudio"
 )
 
 const (
@@ -25,16 +25,17 @@ func init() {
 
 func Run(paths []string, imageChannel chan *image.RGBA, inputChannel chan int) {
 	// initialize audio
-	portaudio.Initialize()
-	defer portaudio.Terminate()
+	// portaudio.Initialize()
+	// defer portaudio.Terminate()
 
-	audio := NewAudio()
-	if err := audio.Start(); err != nil {
-		log.Fatalln(err)
-	}
-	defer audio.Stop()
+	// audio := NewAudio()
+	// if err := audio.Start(); err != nil {
+	// 	log.Fatalln(err)
+	// }
+	// defer audio.Stop()
 
 	// run director
-	director := NewDirector(audio, imageChannel, inputChannel)
+	director := NewDirector(imageChannel, inputChannel)
+	// director := NewDirector(audio, imageChannel, inputChannel)
 	director.Start(paths)
 }