diff --git a/audio.go b/audio.go
index cee1467..e3929e9 100644
--- a/audio.go
+++ b/audio.go
@@ -3,6 +3,7 @@ package sointu
 import (
 	"bytes"
 	"encoding/binary"
+	"errors"
 	"fmt"
 	"math"
 )
@@ -31,6 +32,19 @@ type (
 	}
 )
 
+// Fill fills the AudioBuffer using a Synth, disregarding all syncs and time
+// limits. Note that this will change the state of the Synth.
+func (buffer AudioBuffer) Fill(synth Synth) error {
+	s, _, err := synth.Render(buffer, math.MaxInt32)
+	if err != nil {
+		return fmt.Errorf("synth.Render failed: %v", err)
+	}
+	if s != len(buffer) {
+		return errors.New("in AudioBuffer.Fill, synth.Render should have filled the whole buffer but did not")
+	}
+	return nil
+}
+
 // Wav converts an AudioBuffer into a valid WAV-file, returned as a []byte
 // array.
 //
diff --git a/synth.go b/synth.go
index ae5c8eb..20fc382 100644
--- a/synth.go
+++ b/synth.go
@@ -1,9 +1,7 @@
 package sointu
 
 import (
-	"errors"
 	"fmt"
-	"math"
 )
 
 type (
@@ -40,19 +38,6 @@ type (
 	}
 )
 
-// Render fills an stereo audio buffer using a Synth, disregarding all syncs and
-// time limits.
-func Render(synth Synth, buffer AudioBuffer) error {
-	s, _, err := synth.Render(buffer, math.MaxInt32)
-	if err != nil {
-		return fmt.Errorf("sointu.Render failed: %v", err)
-	}
-	if s != len(buffer) {
-		return errors.New("in sointu.Render, synth.Render should have filled the whole buffer but did not")
-	}
-	return nil
-}
-
 // Play plays the Song by first compiling the patch with the given Synther,
 // returning the stereo audio buffer as a result (and possible errors).
 func Play(synther Synther, song Song) (AudioBuffer, error) {
diff --git a/vm/compiler/bridge/native_synth_test.go b/vm/compiler/bridge/native_synth_test.go
index 189e9b0..ab00a25 100644
--- a/vm/compiler/bridge/native_synth_test.go
+++ b/vm/compiler/bridge/native_synth_test.go
@@ -60,12 +60,12 @@ func TestRenderSamples(t *testing.T) {
 	}
 	synth.Trigger(0, 64)
 	buffer := make(sointu.AudioBuffer, su_max_samples)
-	err = sointu.Render(synth, buffer[:len(buffer)/2])
+	err = buffer[:len(buffer)/2].Fill(synth)
 	if err != nil {
 		t.Fatalf("first render gave an error")
 	}
 	synth.Release(0)
-	err = sointu.Render(synth, buffer[len(buffer)/2:])
+	err = buffer[len(buffer)/2:].Fill(synth)
 	if err != nil {
 		t.Fatalf("first render gave an error")
 	}
@@ -135,7 +135,7 @@ func TestStackUnderflow(t *testing.T) {
 		t.Fatalf("bridge compile error: %v", err)
 	}
 	buffer := make(sointu.AudioBuffer, 1)
-	err = sointu.Render(synth, buffer)
+	err = buffer.Fill(synth)
 	if err == nil {
 		t.Fatalf("rendering should have failed due to stack underflow")
 	}
@@ -151,7 +151,7 @@ func TestStackBalancing(t *testing.T) {
 		t.Fatalf("bridge compile error: %v", err)
 	}
 	buffer := make(sointu.AudioBuffer, 1)
-	err = sointu.Render(synth, buffer)
+	err = buffer.Fill(synth)
 	if err == nil {
 		t.Fatalf("rendering should have failed due to unbalanced stack push/pop")
 	}
@@ -184,7 +184,7 @@ func TestStackOverflow(t *testing.T) {
 		t.Fatalf("bridge compile error: %v", err)
 	}
 	buffer := make(sointu.AudioBuffer, 1)
-	err = sointu.Render(synth, buffer)
+	err = buffer.Fill(synth)
 	if err == nil {
 		t.Fatalf("rendering should have failed due to stack overflow, despite balanced push/pops")
 	}
@@ -201,7 +201,7 @@ func TestDivideByZero(t *testing.T) {
 		t.Fatalf("bridge compile error: %v", err)
 	}
 	buffer := make(sointu.AudioBuffer, 1)
-	err = sointu.Render(synth, buffer)
+	err = buffer.Fill(synth)
 	if err == nil {
 		t.Fatalf("rendering should have failed due to divide by zero")
 	}
diff --git a/vm/go_synth_test.go b/vm/go_synth_test.go
index 1c46bdf..fb219f9 100644
--- a/vm/go_synth_test.go
+++ b/vm/go_synth_test.go
@@ -83,7 +83,7 @@ func TestStackUnderflow(t *testing.T) {
 		t.Fatalf("bridge compile error: %v", err)
 	}
 	buffer := make(sointu.AudioBuffer, 1)
-	err = sointu.Render(synth, buffer)
+	err = buffer.Fill(synth)
 	if err == nil {
 		t.Fatalf("rendering should have failed due to stack underflow")
 	}
@@ -99,7 +99,7 @@ func TestStackBalancing(t *testing.T) {
 		t.Fatalf("bridge compile error: %v", err)
 	}
 	buffer := make(sointu.AudioBuffer, 1)
-	err = sointu.Render(synth, buffer)
+	err = buffer.Fill(synth)
 	if err == nil {
 		t.Fatalf("rendering should have failed due to unbalanced stack push/pop")
 	}