diff --git a/example/audio/main.go b/example/audio/main.go
index feae6992c..d1ebcf7d6 100644
--- a/example/audio/main.go
+++ b/example/audio/main.go
@@ -27,6 +27,7 @@ import (
 const (
 	screenWidth  = 320
 	screenHeight = 240
+	sampleRate   = 44100
 )
 
 var frames = 0
@@ -57,7 +58,7 @@ func square(out []int16, volume float64, freq float64, sequence float64) {
 		}
 		return
 	}
-	length := int(float64(audio.SampleRate) / freq)
+	length := int(float64(sampleRate) / freq)
 	if length == 0 {
 		panic("invalid freq")
 	}
@@ -85,7 +86,7 @@ func toBytes(l, r []int16) []byte {
 }
 
 func addNote() {
-	size := audio.SampleRate / 60
+	size := sampleRate / 60
 	notes := []float64{freqC, freqD, freqE, freqF, freqG, freqA * 2, freqB * 2}
 
 	defer func() {
diff --git a/example/piano/main.go b/example/piano/main.go
index 1c7ef1102..1e0edf460 100644
--- a/example/piano/main.go
+++ b/example/piano/main.go
@@ -29,14 +29,15 @@ import (
 const (
 	screenWidth  = 320
 	screenHeight = 240
+	sampleRate   = 44100
 )
 
-var pcm = make([]float64, 4*audio.SampleRate)
+var pcm = make([]float64, 4*sampleRate)
 
 const baseFreq = 220
 
 func init() {
-	s := float64(audio.SampleRate)
+	s := float64(sampleRate)
 	amp := []float64{1.0, 0.8, 0.6, 0.4, 0.2}
 	x := []float64{4.0, 2.0, 1.0, 0.5, 0.25}
 	for i := 0; i < len(pcm); i++ {
diff --git a/exp/audio/audio.go b/exp/audio/audio.go
index 798254a28..04aa703d0 100644
--- a/exp/audio/audio.go
+++ b/exp/audio/audio.go
@@ -18,25 +18,16 @@ import (
 	"github.com/hajimehoshi/ebiten/internal/audio"
 )
 
-// SampleRate returns the sampling frequency (e.g. 44100).
-const SampleRate = audio.SampleRate
-
-// MaxChannel is a max number of channels.
-const MaxChannel = audio.MaxChannel
-
 // Queue queues the given data to the given channel.
 // The given data is queued to the end of the buffer.
 // This may not be played immediately when data already exists in the buffer.
 //
 // data's format must be linear PCM (44100Hz, 16bits, 2 channel stereo, little endian)
 // without a header (e.g. RIFF header).
+//
+// TODO: Pass sample rate and num of channels.
 func Queue(data []byte) bool {
 	return audio.Queue(data)
 }
 
-// IsPlaying returns a boolean value which indicates if the channel buffer has data to play.
-func IsPlaying(channel int) bool {
-	return audio.IsPlaying(channel)
-}
-
 // TODO: Add Clear function