diff --git a/README.md b/README.md
index c9787fb..4a1870a 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,54 @@
 # ahsai
 AH Soft フリーテキスト音声合成 demo API
+
+## demo
+Just run go test to hear the voice below
+
+<audio src='/test.wav' controls><a href='/test.wav'>こんにちは、世界</a></audio>
+
+```go
+package ahsai
+
+import "testing"
+
+func TestAPI(t *testing.T) {
+	s := NewSpeaker()
+	err := s.SetName("東北イタコ")
+	if err != nil {
+		t.Fatal(err)
+	}
+	u, err := s.Speak("こんにちは、世界")
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Log(u)
+	err = PlayOgg(u)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = SaveOggToWav(u, "test.wav")
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+```
+
+## supported speakers
+- 琴葉葵
+- 琴葉茜
+- 紲星あかり
+- 吉田くん
+- 東北ずん子
+- 月読アイ
+- 月読ショウタ
+- 民安ともえ
+- 結月ゆかり
+- 水奈瀬コウ
+- 京町セイカ
+- 東北きりたん
+- 桜乃そら
+- 東北イタコ
+- ついなちゃん標準語
+- ついなちゃん関西弁
+- 伊織弓鶴
+- 音街ウナ
\ No newline at end of file
diff --git a/api.go b/api.go
new file mode 100644
index 0000000..da0cc36
--- /dev/null
+++ b/api.go
@@ -0,0 +1,85 @@
+package ahsai
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"time"
+)
+
+const api = "https://cloud.ai-j.jp/demo/aitalk2webapi_nop.php?callback=callback&speaker_id=%d&text=%s&ext=ogg&volume=%.1f&speed=%.1f&pitch=%.1f&range=%.1f&anger=%.1f&sadness=%.1f&joy=%.1f&_=%d"
+
+var (
+	speakers = map[string]uint32{
+		"琴葉葵":       551,
+		"琴葉茜":       552,
+		"紲星あかり":     554,
+		"吉田くん":      1201,
+		"東北ずん子":     1202,
+		"月読アイ":      1203,
+		"月読ショウタ":    1204,
+		"民安ともえ":     1205,
+		"結月ゆかり":     1206,
+		"水奈瀬コウ":     1207,
+		"京町セイカ":     1208,
+		"東北きりたん":    1209,
+		"桜乃そら":      1210,
+		"東北イタコ":     1211,
+		"ついなちゃん標準語": 1212,
+		"ついなちゃん関西弁": 1213,
+		"伊織弓鶴":      1214,
+		"音街ウナ":      2006,
+	}
+)
+
+type Speaker struct {
+	id                                               uint32
+	Volume, Speed, Pitch, Range, Anger, Sadness, Joy float32
+}
+
+func NewSpeaker() (s Speaker) {
+	s.Volume = 1
+	s.Speed = 1
+	s.Pitch = 1
+	s.Range = 1
+	return
+}
+
+var (
+	// ErrTextTooLong 文本超过 100 字
+	ErrTextTooLong = errors.New("text too long")
+	// ErrNoSuchSpeaker 查无此人
+	ErrNoSuchSpeaker = errors.New("no such speaker")
+)
+
+func (s *Speaker) SetName(name string) error {
+	id, ok := speakers[name]
+	if !ok {
+		return ErrNoSuchSpeaker
+	}
+	s.id = id
+	return nil
+}
+
+// Speak text, return ogg url
+func (s *Speaker) Speak(text string) (string, error) {
+	if len([]rune(text)) > 100 {
+		return "", ErrTextTooLong
+	}
+	resp, err := http.Get(fmt.Sprintf(api, s.id, url.QueryEscape(text), s.Volume, s.Speed, s.Pitch, s.Range, s.Anger, s.Sadness, s.Joy, time.Now().UnixMilli()))
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", err
+	}
+	data = bytes.TrimPrefix(data, []byte(`callback({"url":"`))
+	data = bytes.TrimSuffix(data, []byte(`"})`))
+	data = bytes.ReplaceAll(data, []byte(`\/`), []byte(`/`))
+	return "https:" + string(data), nil
+}
diff --git a/api_test.go b/api_test.go
new file mode 100644
index 0000000..287e581
--- /dev/null
+++ b/api_test.go
@@ -0,0 +1,24 @@
+package ahsai
+
+import "testing"
+
+func TestAPI(t *testing.T) {
+	s := NewSpeaker()
+	err := s.SetName("東北イタコ")
+	if err != nil {
+		t.Fatal(err)
+	}
+	u, err := s.Speak("こんにちは、世界")
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Log(u)
+	err = PlayOgg(u)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = SaveOggToWav(u, "test.wav")
+	if err != nil {
+		t.Fatal(err)
+	}
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..6354701
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,16 @@
+module github.com/fumiama/ahsai
+
+go 1.17
+
+require github.com/faiface/beep v1.1.0
+
+require (
+	github.com/hajimehoshi/oto v0.7.1 // indirect
+	github.com/jfreymuth/oggvorbis v1.0.1 // indirect
+	github.com/jfreymuth/vorbis v1.0.0 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8 // indirect
+	golang.org/x/image v0.0.0-20190227222117-0694c2d4d067 // indirect
+	golang.org/x/mobile v0.0.0-20190415191353-3e0bab5405d6 // indirect
+	golang.org/x/sys v0.0.0-20190626150813-e07cf5db2756 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..d04e859
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,39 @@
+github.com/DATA-DOG/go-sqlmock v1.3.3/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
+github.com/d4l3k/messagediff v1.2.2-0.20190829033028-7e0a312ae40b/go.mod h1:Oozbb1TVXFac9FtSIxHBMnBCq2qeH/2KkEQxENCrlLo=
+github.com/faiface/beep v1.1.0 h1:A2gWP6xf5Rh7RG/p9/VAW2jRSDEGQm5sbOb38sf5d4c=
+github.com/faiface/beep v1.1.0/go.mod h1:6I8p6kK2q4opL/eWb+kAkk38ehnTunWeToJB+s51sT4=
+github.com/gdamore/encoding v1.0.0/go.mod h1:alR0ol34c49FCSBLjhosxzcPHQbf2trDkoo5dl+VrEg=
+github.com/gdamore/tcell v1.3.0/go.mod h1:Hjvr+Ofd+gLglo7RYKxxnzCBmev3BzsS67MebKS4zMM=
+github.com/go-audio/audio v1.0.0/go.mod h1:6uAu0+H2lHkwdGsAY+j2wHPNPpPoeg5AaEFh9FlA+Zs=
+github.com/go-audio/riff v1.0.0/go.mod h1:l3cQwc85y79NQFCRB7TiPoNiaijp6q8Z0Uv38rVG498=
+github.com/go-audio/wav v1.0.0/go.mod h1:3yoReyQOsiARkvPl3ERCi8JFjihzG6WhjYpZCf5zAWE=
+github.com/hajimehoshi/go-mp3 v0.3.0/go.mod h1:qMJj/CSDxx6CGHiZeCgbiq2DSUkbK0UbtXShQcnfyMM=
+github.com/hajimehoshi/oto v0.6.1/go.mod h1:0QXGEkbuJRohbJaxr7ZQSxnju7hEhseiPx2hrh6raOI=
+github.com/hajimehoshi/oto v0.7.1 h1:I7maFPz5MBCwiutOrz++DLdbr4rTzBsbBuV2VpgU9kk=
+github.com/hajimehoshi/oto v0.7.1/go.mod h1:wovJ8WWMfFKvP587mhHgot/MBr4DnNy9m6EepeVGnos=
+github.com/icza/bitio v1.0.0/go.mod h1:0jGnlLAx8MKMr9VGnn/4YrvZiprkvBelsVIbA9Jjr9A=
+github.com/icza/mighty v0.0.0-20180919140131-cfd07d671de6/go.mod h1:xQig96I1VNBDIWGCdTt54nHt6EeI639SmHycLYL7FkA=
+github.com/jfreymuth/oggvorbis v1.0.1 h1:NT0eXBgE2WHzu6RT/6zcb2H10Kxj6Fm3PccT0LE6bqw=
+github.com/jfreymuth/oggvorbis v1.0.1/go.mod h1:NqS+K+UXKje0FUYUPosyQ+XTVvjmVjps1aEZH1sumIk=
+github.com/jfreymuth/vorbis v1.0.0 h1:SmDf783s82lIjGZi8EGUUaS7YxPHgRj4ZXW/h7rUi7U=
+github.com/jfreymuth/vorbis v1.0.0/go.mod h1:8zy3lUAm9K/rJJk223RKy6vjCZTWC61NA2QD06bfOE0=
+github.com/lucasb-eyer/go-colorful v1.0.2/go.mod h1:0MS4r+7BZKSJ5mw4/S5MPN+qHFF1fYclkSPilDOKW0s=
+github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
+github.com/mewkiz/flac v1.0.7/go.mod h1:yU74UH277dBUpqxPouHSQIar3G1X/QIclVbFahSd1pU=
+github.com/mewkiz/pkg v0.0.0-20190919212034-518ade7978e2/go.mod h1:3E2FUC/qYUfM8+r9zAwpeHJzqRVVMIYnpzD/clwWxyA=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8 h1:idBdZTd9UioThJp8KpM/rTSinK/ChZFBE43/WtIy8zg=
+golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
+golang.org/x/image v0.0.0-20190220214146-31aff87c08e9/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
+golang.org/x/image v0.0.0-20190227222117-0694c2d4d067 h1:KYGJGHOQy8oSi1fDlSpcZF0+juKwk/hEMv5SiwHogR0=
+golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
+golang.org/x/mobile v0.0.0-20190415191353-3e0bab5405d6 h1:vyLBGJPIl9ZYbcQFM2USFmJBK6KI+t+z6jL0lbwjrnc=
+golang.org/x/mobile v0.0.0-20190415191353-3e0bab5405d6/go.mod h1:E/iHnbuqvinMTCcRqshq8CkpyQDoeVncDDYHnLhea+o=
+golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190429190828-d89cdac9e872/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190626150813-e07cf5db2756 h1:9nuHUbU8dRnRRfj9KjWUVrJeoexdbeMjttk6Oh1rD10=
+golang.org/x/sys v0.0.0-20190626150813-e07cf5db2756/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
diff --git a/ogg.go b/ogg.go
new file mode 100644
index 0000000..c48f4fa
--- /dev/null
+++ b/ogg.go
@@ -0,0 +1,76 @@
+package ahsai
+
+import (
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/faiface/beep"
+	"github.com/faiface/beep/speaker"
+	"github.com/faiface/beep/vorbis"
+	"github.com/faiface/beep/wav"
+)
+
+func SaveOggToWav(u, path string) error {
+	resp, err := http.Get(u)
+	if err != nil {
+		return err
+	}
+	s, format, err := vorbis.Decode(resp.Body)
+	if err != nil {
+		resp.Body.Close()
+		return err
+	}
+	defer s.Close()
+	f, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	tmp := make([][2]float64, 1024)
+	_, _ = s.Stream(tmp)
+	sum := (tmp[0][0] + tmp[0][1]) / 2
+	for sum > 1e-32 || sum < -1e-32 {
+		_, _ = s.Stream(tmp)
+		sum = (tmp[0][0] + tmp[0][1]) / 2
+		for j := 1; j < 1024; j++ {
+			sum += (tmp[j][0] + tmp[j][1]) / 2
+			sum /= 2
+		}
+	}
+	return wav.Encode(f, s, format)
+}
+
+func PlayOgg(u string) error {
+	resp, err := http.Get(u)
+	if err != nil {
+		return err
+	}
+	s, format, err := vorbis.Decode(resp.Body)
+	if err != nil {
+		resp.Body.Close()
+		return err
+	}
+	defer s.Close()
+	tmp := make([][2]float64, 1024)
+	_, _ = s.Stream(tmp)
+	sum := (tmp[0][0] + tmp[0][1]) / 2
+	for sum > 1e-32 || sum < -1e-32 {
+		_, _ = s.Stream(tmp)
+		sum = (tmp[0][0] + tmp[0][1]) / 2
+		for j := 1; j < 1024; j++ {
+			sum += (tmp[j][0] + tmp[j][1]) / 2
+			sum /= 2
+		}
+	}
+	err = speaker.Init(format.SampleRate, format.SampleRate.N(time.Second/32))
+	if err != nil {
+		return err
+	}
+	done := make(chan struct{})
+	speaker.Play(beep.Seq(s, beep.Callback(func() {
+		done <- struct{}{}
+	})))
+	<-done
+	return nil
+}
diff --git a/test.wav b/test.wav
new file mode 100644
index 0000000..5cb6d8d
Binary files /dev/null and b/test.wav differ