diff --git a/_docs/public/example/blocks.content.html b/_docs/public/example/blocks.content.html
index 9ba0f8567..8083b265f 100644
--- a/_docs/public/example/blocks.content.html
+++ b/_docs/public/example/blocks.content.html
@@ -31,7 +31,7 @@ window.addEventListener('load', function() {
   var s = document.createElement('script');
   var src = 'blocks.js';
   if (isProduction()) {
-    src = 'http://hajimehoshi.github.io/ebiten.pagestorage/master/' + src;
+    src = 'http://hajimehoshi.github.io/ebiten.pagestorage/audio/' + src;
   }
   s.src = src;
   document.body.appendChild(s);
diff --git a/_docs/public/example/hue.content.html b/_docs/public/example/hue.content.html
index 66fecdf3f..c5dcb62c6 100644
--- a/_docs/public/example/hue.content.html
+++ b/_docs/public/example/hue.content.html
@@ -31,7 +31,7 @@ window.addEventListener('load', function() {
   var s = document.createElement('script');
   var src = 'hue.js';
   if (isProduction()) {
-    src = 'http://hajimehoshi.github.io/ebiten.pagestorage/master/' + src;
+    src = 'http://hajimehoshi.github.io/ebiten.pagestorage/audio/' + src;
   }
   s.src = src;
   document.body.appendChild(s);
diff --git a/_docs/public/example/keyboard.content.html b/_docs/public/example/keyboard.content.html
index b68a5b8b6..c35a01574 100644
--- a/_docs/public/example/keyboard.content.html
+++ b/_docs/public/example/keyboard.content.html
@@ -31,7 +31,7 @@ window.addEventListener('load', function() {
   var s = document.createElement('script');
   var src = 'keyboard.js';
   if (isProduction()) {
-    src = 'http://hajimehoshi.github.io/ebiten.pagestorage/master/' + src;
+    src = 'http://hajimehoshi.github.io/ebiten.pagestorage/audio/' + src;
   }
   s.src = src;
   document.body.appendChild(s);
diff --git a/_docs/public/example/mosaic.content.html b/_docs/public/example/mosaic.content.html
index 581739780..87ae921b5 100644
--- a/_docs/public/example/mosaic.content.html
+++ b/_docs/public/example/mosaic.content.html
@@ -31,7 +31,7 @@ window.addEventListener('load', function() {
   var s = document.createElement('script');
   var src = 'mosaic.js';
   if (isProduction()) {
-    src = 'http://hajimehoshi.github.io/ebiten.pagestorage/master/' + src;
+    src = 'http://hajimehoshi.github.io/ebiten.pagestorage/audio/' + src;
   }
   s.src = src;
   document.body.appendChild(s);
diff --git a/_docs/public/example/paint.content.html b/_docs/public/example/paint.content.html
index 2d7fb4dd8..66b75e748 100644
--- a/_docs/public/example/paint.content.html
+++ b/_docs/public/example/paint.content.html
@@ -31,7 +31,7 @@ window.addEventListener('load', function() {
   var s = document.createElement('script');
   var src = 'paint.js';
   if (isProduction()) {
-    src = 'http://hajimehoshi.github.io/ebiten.pagestorage/master/' + src;
+    src = 'http://hajimehoshi.github.io/ebiten.pagestorage/audio/' + src;
   }
   s.src = src;
   document.body.appendChild(s);
diff --git a/_docs/public/example/perspective.content.html b/_docs/public/example/perspective.content.html
index fb89faec9..7deccf0ca 100644
--- a/_docs/public/example/perspective.content.html
+++ b/_docs/public/example/perspective.content.html
@@ -31,7 +31,7 @@ window.addEventListener('load', function() {
   var s = document.createElement('script');
   var src = 'perspective.js';
   if (isProduction()) {
-    src = 'http://hajimehoshi.github.io/ebiten.pagestorage/master/' + src;
+    src = 'http://hajimehoshi.github.io/ebiten.pagestorage/audio/' + src;
   }
   s.src = src;
   document.body.appendChild(s);
diff --git a/_docs/public/example/rotate.content.html b/_docs/public/example/rotate.content.html
index d0aaa42c3..e9c53ecae 100644
--- a/_docs/public/example/rotate.content.html
+++ b/_docs/public/example/rotate.content.html
@@ -31,7 +31,7 @@ window.addEventListener('load', function() {
   var s = document.createElement('script');
   var src = 'rotate.js';
   if (isProduction()) {
-    src = 'http://hajimehoshi.github.io/ebiten.pagestorage/master/' + src;
+    src = 'http://hajimehoshi.github.io/ebiten.pagestorage/audio/' + src;
   }
   s.src = src;
   document.body.appendChild(s);
diff --git a/example/_server/main.go b/example/_server/main.go
index 31ad16aff..e87fe0cf3 100644
--- a/example/_server/main.go
+++ b/example/_server/main.go
@@ -61,7 +61,7 @@ func createJSIfNeeded(name string) (string, error) {
 	if err != nil && !os.IsNotExist(err) {
 		return "", err
 	}
-	if (err != nil && os.IsNotExist(err)) || time.Now().Sub(stat.ModTime()) > 10*time.Second {
+	if (err != nil && os.IsNotExist(err)) || time.Now().Sub(stat.ModTime()) > 5*time.Second {
 		target := "github.com/hajimehoshi/ebiten/example/" + name
 		out, err := exec.Command("gopherjs", "build", "-o", out, target).CombinedOutput()
 		if err != nil {
diff --git a/example/audio/main.go b/example/audio/main.go
new file mode 100644
index 000000000..2b67b240f
--- /dev/null
+++ b/example/audio/main.go
@@ -0,0 +1,117 @@
+// Copyright 2015 Hajime Hoshi
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/ebitenutil"
+	"github.com/hajimehoshi/ebiten/exp/audio"
+	"log"
+)
+
+const (
+	screenWidth  = 320
+	screenHeight = 240
+)
+
+var frames = 0
+
+const (
+	freqA  = 440.0
+	freqAS = 466.2
+	freqB  = 493.9
+	freqC  = 523.3
+	freqCS = 554.4
+	freqD  = 587.3
+	freqDS = 622.3
+	freqE  = 659.3
+	freqF  = 698.5
+	freqFS = 740.0
+	freqG  = 784.0
+	freqGS = 830.6
+)
+
+const score = `CCGGAAGR FFEEDDCR GGFFEEDR GGFFEEDR CCGGAAGR FFEEDDCR`
+
+var scoreIndex = 0
+
+func square(out []float32, volume float64, freq float64, sequence float64) {
+	if freq == 0 {
+		for i := 0; i < len(out); i++ {
+			out[i] = 0
+		}
+		return
+	}
+	length := int(float64(audio.SampleRate()) / freq)
+	if length == 0 {
+		panic("invalid freq")
+	}
+	for i := 0; i < len(out); i++ {
+		a := float32(volume)
+		if i%length < int(float64(length)*sequence) {
+			a = 0
+		}
+		out[i] = a
+	}
+}
+
+func addNote() {
+	size := audio.SampleRate() / 60
+	notes := []float64{freqC, freqD, freqE, freqF, freqG, freqA * 2, freqB * 2}
+
+	defer func() {
+		scoreIndex++
+		scoreIndex %= len(score)
+	}()
+	l := make([]float32, size*30)
+	r := make([]float32, size*30)
+	note := score[scoreIndex]
+	for note == ' ' {
+		scoreIndex++
+		scoreIndex %= len(score)
+		note = score[scoreIndex]
+	}
+	freq := 0.0
+	switch {
+	case note == 'R':
+		freq = 0
+	case note <= 'B':
+		freq = notes[int(note)+len(notes)-int('C')]
+	default:
+		freq = notes[note-'C']
+	}
+	vol := 1.0 / 16.0
+	square(l, vol, freq, 0.25)
+	square(r, vol, freq, 0.25)
+	audio.AppendToBuffer(0, l, r)
+}
+
+func update(screen *ebiten.Image) error {
+	defer func() {
+		frames++
+	}()
+	if frames%30 == 0 {
+		addNote()
+	}
+	ebitenutil.DebugPrint(screen, fmt.Sprintf("FPS: %0.2f", ebiten.CurrentFPS()))
+	return nil
+}
+
+func main() {
+	if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Rotate (Ebiten Demo)"); err != nil {
+		log.Fatal(err)
+	}
+}
diff --git a/exp/audio/audio.go b/exp/audio/audio.go
new file mode 100644
index 000000000..5c4822e98
--- /dev/null
+++ b/exp/audio/audio.go
@@ -0,0 +1,32 @@
+// Copyright 2015 Hajime Hoshi
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package audio
+
+import (
+	"github.com/hajimehoshi/ebiten/internal/audio"
+)
+
+func SampleRate() int {
+	return audio.SampleRate
+}
+
+func AppendToBuffer(channel int, l []float32, r []float32) bool {
+	return audio.Append(channel, l, r)
+}
+
+// TODO: better name
+func CurrentTime() int {
+	return audio.CurrentBytes()
+}
diff --git a/internal/audio/audio.go b/internal/audio/audio.go
new file mode 100644
index 000000000..2d6093e24
--- /dev/null
+++ b/internal/audio/audio.go
@@ -0,0 +1,41 @@
+// Copyright 2015 Hajime Hoshi
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !js
+
+package audio
+
+const SampleRate = 44100
+
+func Init() {
+	// TODO: Implement
+}
+
+func Start() {
+	// TODO: Implement
+}
+
+func Append(channel int, l []float32, r []float32) bool {
+	// TODO: Implement
+	return false
+}
+
+func CurrentBytes() int {
+	// TODO: Implement
+	return 0
+}
+
+func Update() {
+	// TODO: Implement
+}
diff --git a/internal/audio/audio_js.go b/internal/audio/audio_js.go
new file mode 100644
index 000000000..a0dc7aac7
--- /dev/null
+++ b/internal/audio/audio_js.go
@@ -0,0 +1,142 @@
+// Copyright 2015 Hajime Hoshi
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build js
+
+package audio
+
+import (
+	"github.com/gopherjs/gopherjs/js"
+)
+
+// Keep this so as not to be destroyed by GC.
+var node js.Object
+var context js.Object
+
+const bufferSize = 1024
+const SampleRate = 44100
+
+var nextInsertion = 0
+
+type channel struct {
+	l []float32
+	r []float32
+}
+
+var channels = make([]*channel, 16)
+
+func init() {
+	for i, _ := range channels {
+		channels[i] = &channel{
+			l: []float32{},
+			r: []float32{},
+		}
+	}
+}
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+var currentBytes = 0
+
+func CurrentBytes() int {
+	return currentBytes
+}
+
+func Init() {
+	context = js.Global.Get("AudioContext").New()
+	// TODO: ScriptProcessorNode will be replaced with Audio WebWorker.
+	// https://developer.mozilla.org/ja/docs/Web/API/ScriptProcessorNode
+	node = context.Call("createScriptProcessor", bufferSize, 0, 2)
+	node.Call("addEventListener", "audioprocess", func(e js.Object) {
+		defer func() {
+			currentBytes += bufferSize
+		}()
+
+		l := e.Get("outputBuffer").Call("getChannelData", 0)
+		r := e.Get("outputBuffer").Call("getChannelData", 1)
+		inputL := make([]float32, bufferSize)
+		inputR := make([]float32, bufferSize)
+		for _, ch := range channels {
+			if len(ch.l) == 0 {
+				continue
+			}
+			l := min(len(ch.l), bufferSize)
+			for i := 0; i < l; i++ {
+				inputL[i] += ch.l[i]
+				inputR[i] += ch.r[i]
+			}
+			// TODO: Use copyFromChannel?
+			usedLen := min(bufferSize, len(ch.l))
+			ch.l = ch.l[usedLen:]
+			ch.r = ch.r[usedLen:]
+		}
+		nextInsertion -= min(bufferSize, nextInsertion)
+		for i := 0; i < bufferSize; i++ {
+			// TODO: Use copyFromChannel?
+			if len(inputL) <= i {
+				l.SetIndex(i, 0)
+				r.SetIndex(i, 0)
+				continue
+			}
+			l.SetIndex(i, inputL[i])
+			r.SetIndex(i, inputR[i])
+		}
+	})
+}
+
+func Update() {
+	nextInsertion += SampleRate / 60
+}
+
+func Start() {
+	// TODO: For iOS, node should be connected with a buffer node.
+	node.Call("connect", context.Get("destination"))
+}
+
+func channelAt(i int) *channel {
+	if i == -1 {
+		for _, ch := range channels {
+			if len(ch.l) <= nextInsertion {
+				return ch
+			}
+		}
+		return nil
+	}
+	ch := channels[i]
+	if len(ch.l) <= nextInsertion {
+		return ch
+	}
+	return nil
+}
+
+func Append(i int, l []float32, r []float32) bool {
+	// TODO: Mutex (especially for OpenAL)
+	if len(l) != len(r) {
+		panic("len(l) must equal to len(r)")
+	}
+	ch := channelAt(i)
+	if ch == nil {
+		return false
+	}
+	ch.l = append(ch.l, make([]float32, nextInsertion-len(ch.l))...)
+	ch.r = append(ch.r, make([]float32, nextInsertion-len(ch.r))...)
+	ch.l = append(ch.l, l...)
+	ch.r = append(ch.r, r...)
+	return true
+}
diff --git a/internal/ui/ui_glfw.go b/internal/ui/ui_glfw.go
index 893e48e62..60398deb9 100644
--- a/internal/ui/ui_glfw.go
+++ b/internal/ui/ui_glfw.go
@@ -19,6 +19,7 @@ package ui
 import (
 	"fmt"
 	glfw "github.com/go-gl/glfw3"
+	"github.com/hajimehoshi/ebiten/internal/audio"
 	"github.com/hajimehoshi/ebiten/internal/opengl"
 	"runtime"
 	"time"
@@ -81,6 +82,9 @@ func init() {
 			f()
 		}
 	}()
+
+	audio.Init()
+
 	current = u
 }
 
@@ -133,6 +137,8 @@ func Start(width, height, scale int, title string) (actualScale int, err error)
 	windowWidth, _ := window.GetFramebufferSize()
 	actualScale = windowWidth / width
 
+	audio.Start()
+
 	return actualScale, nil
 }
 
diff --git a/internal/ui/ui_js.go b/internal/ui/ui_js.go
index 8af9d97a6..4f339f13d 100644
--- a/internal/ui/ui_js.go
+++ b/internal/ui/ui_js.go
@@ -19,6 +19,7 @@ package ui
 import (
 	"github.com/gopherjs/gopherjs/js"
 	"github.com/gopherjs/webgl"
+	"github.com/hajimehoshi/ebiten/internal/audio"
 	"github.com/hajimehoshi/ebiten/internal/opengl"
 	"strconv"
 )
@@ -26,6 +27,8 @@ import (
 var canvas js.Object
 var context *opengl.Context
 
+// TODO: This returns true even when the browser is not active.
+// The current behavior causes sound noise...
 func shown() bool {
 	return !js.Global.Get("document").Get("hidden").Bool()
 }
@@ -36,6 +39,8 @@ func Use(f func(*opengl.Context)) {
 
 func vsync() {
 	ch := make(chan struct{})
+	// TODO: In iOS8, this is called at every 1/30[sec] frame.
+	// Can we use DOMHighResTimeStamp?
 	js.Global.Get("window").Call("requestAnimationFrame", func() {
 		close(ch)
 	})
@@ -178,6 +183,8 @@ func init() {
 	window.Call("addEventListener", "gamepadconnected", func(e js.Object) {
 		// Do nothing.
 	})
+
+	audio.Init()
 }
 
 func setMouseCursorFromEvent(e js.Object) {
@@ -217,5 +224,7 @@ func Start(width, height, scale int, title string) (actualScale int, err error)
 
 	canvas.Call("focus")
 
+	audio.Start()
+
 	return actualScale, nil
 }
diff --git a/run.go b/run.go
index dbb9fd793..ebcab0d0a 100644
--- a/run.go
+++ b/run.go
@@ -15,6 +15,7 @@
 package ebiten
 
 import (
+	"github.com/hajimehoshi/ebiten/internal/audio"
 	"github.com/hajimehoshi/ebiten/internal/opengl"
 	"github.com/hajimehoshi/ebiten/internal/ui"
 	"time"
@@ -69,6 +70,8 @@ func Run(f func(*Image) error, width, height, scale int, title string) error {
 		if err := graphicsContext.postUpdate(); err != nil {
 			return err
 		}
+		// TODO: I'm not sure this is 'Update'. Is 'Tick' better?
+		audio.Update()
 		ui.SwapBuffers()
 		if err != nil {
 			return err