diff --git a/audio/internal/driver/driver_js.go b/audio/internal/driver/driver_js.go
index c4410bc0d..5333c8894 100644
--- a/audio/internal/driver/driver_js.go
+++ b/audio/internal/driver/driver_js.go
@@ -23,6 +23,11 @@ import (
 	"github.com/gopherjs/gopherjs/js"
 )
 
+// positionDelay is buffer in sample numbers for p.positionInSamples.
+// Without this, adjusting p.positionInSamples with the context's currenTime
+// much more often especially on Safari, which is the cause of noise (#307).
+const positionDelay = 256
+
 type Player struct {
 	sampleRate        int
 	channelNum        int
@@ -73,10 +78,10 @@ func NewPlayer(sampleRate, channelNum, bytesPerSample int) (*Player, error) {
 			// domain page in an iframe.
 			p.context.Call("resume")
 			p.context.Call("createBufferSource").Call("start", 0)
-			p.positionInSamples = int64(p.context.Get("currentTime").Float() * float64(p.sampleRate))
+			p.positionInSamples = int64(p.context.Get("currentTime").Float()*float64(p.sampleRate)) + positionDelay
 		})
 	}
-	p.positionInSamples = int64(p.context.Get("currentTime").Float() * float64(p.sampleRate))
+	p.positionInSamples = int64(p.context.Get("currentTime").Float()*float64(p.sampleRate)) + positionDelay
 	return p, nil
 }
 
@@ -91,13 +96,9 @@ func toLR(data []byte) ([]int16, []int16) {
 }
 
 func (p *Player) Proceed(data []byte) error {
-	// delay is buffer in sample numbers for p.positionInSamples.
-	// Without this, adjusting p.positionInSamples with the context's currenTime
-	// much more often especially on Safari, which is the cause of noise (#307).
-	const delay = 256
 	p.bufferedData = append(p.bufferedData, data...)
 	c := int64(p.context.Get("currentTime").Float() * float64(p.sampleRate))
-	if p.positionInSamples+delay < c {
+	if p.positionInSamples+positionDelay < c {
 		p.positionInSamples = c
 	}
 	// Heuristic data size which doesn't cause too much noise and too much delay (#299)
@@ -118,7 +119,7 @@ func (p *Player) Proceed(data []byte) error {
 		s := p.context.Call("createBufferSource")
 		s.Set("buffer", buf)
 		s.Call("connect", p.context.Get("destination"))
-		s.Call("start", float64(p.positionInSamples+delay)/float64(p.sampleRate))
+		s.Call("start", float64(p.positionInSamples+positionDelay)/float64(p.sampleRate))
 		p.positionInSamples += int64(len(il))
 		p.bufferedData = p.bufferedData[dataSize:]
 	}