diff --git a/src/main/java/vavi/sound/sampled/nsf/Nsf2PcmAudioInputStream.java b/src/main/java/vavi/sound/sampled/nsf/Nsf2PcmAudioInputStream.java
index a9f5cfe..e0ce670 100644
--- a/src/main/java/vavi/sound/sampled/nsf/Nsf2PcmAudioInputStream.java
+++ b/src/main/java/vavi/sound/sampled/nsf/Nsf2PcmAudioInputStream.java
@@ -110,6 +110,8 @@ public NSFOutputEngine(InputStream in, Map<String, Object> props) throws IOExcep
         /** the thread which executes buffer#take() */
         private Thread blockingDequeThread;
 
+        private volatile boolean finished = false;
+
         /** */
         public void initialize(OutputStream out) throws IOException {
             if (this.out != null) {
@@ -160,12 +162,7 @@ public void write(byte b) {
                         public void finish() {
                             blockingDequeThread.interrupt();
 Debug.println(Level.FINE, "sink finish");
-                            try {
-                                out.close(); // TODO wait write finished
-                            } catch (IOException e) {
-                                finish();
-                                throw new UncheckedIOException(e);
-                            }
+                            finished = true;
                         }
                     });
                 } catch (IOException e) {
@@ -173,28 +170,21 @@ public void finish() {
                 }
             });
 
-            try {
-                // rendering is too slow, wait buffering
-                Thread.sleep(1000);
-            } catch (InterruptedException e) {
-                Debug.printStackTrace(e);
-            }
-
             blockingDequeThread = Thread.currentThread();
         }
 
         static final int BUFFER_SIZE = 16;
 
-        byte[] buf = new byte[BUFFER_SIZE];
-
         /** */
         public void execute() throws IOException {
             try {
                 int c = 0;
-                while (buffer.peek() != null || c++ < BUFFER_SIZE) {
+                while (buffer.peek() != null && c++ < BUFFER_SIZE) {
                     out.write(buffer.take());
                 }
-                Thread.yield();
+                if (finished) {
+                    out.close();
+                }
 //Debug.println(Level.FINER, "write: " + i + ", " + buffer.size());
             } catch (InterruptedException e) {
 Debug.println(Level.FINE, "BlockingDeque#take() interrupted");
diff --git a/src/test/java/TestCase.java b/src/test/java/TestCase.java
index e622852..846b74d 100644
--- a/src/test/java/TestCase.java
+++ b/src/test/java/TestCase.java
@@ -35,6 +35,8 @@
 /**
  * TestCase.
  *
+ * clip takes a bit time for loading all, so not tested
+ *
  * @author <a href="mailto:umjammer@gmail.com">Naohide Sano</a> (umjammer)
  * @version 0.00 2012/06/11 umjammer initial version <br>
  */
@@ -65,7 +67,7 @@ void setup() throws Exception {
     static int time = System.getProperty("vavi.test", "").equals("ide") ? 1000 : 10;
 
     @Test
-    @DisplayName("directly, clip takes a bit time for loading all")
+    @DisplayName("directly")
     void test0() throws Exception {
         Map<String, Object> props = new HashMap<>();
         props.put("track", 5);
@@ -84,22 +86,27 @@ void test0() throws Exception {
         AudioInputStream ais = new Nsf2PcmAudioInputStream(Files.newInputStream(Paths.get(inFile)), targetAudioFormat, -1);
 Debug.println(targetAudioFormat);
 
-        DataLine.Info info = new DataLine.Info(Clip.class, targetAudioFormat, AudioSystem.NOT_SPECIFIED);
-        CountDownLatch cdl = new CountDownLatch(1);
-        Clip clip = (Clip) AudioSystem.getLine(info);
-Debug.println(clip.getClass().getName());
-        clip.addLineListener(event -> {
-Debug.println(event.getType());
-            if (event.getType().equals(LineEvent.Type.STOP)) {
-                cdl.countDown();
-            }
-        });
-        clip.open(ais);
-        volume(clip, volume);
+        DataLine.Info info = new DataLine.Info(SourceDataLine.class, targetAudioFormat, AudioSystem.NOT_SPECIFIED);
+        SourceDataLine line = (SourceDataLine) AudioSystem.getLine(info);
+        Debug.println(line.getClass().getName());
+        line.addLineListener(event -> Debug.println(event.getType()));
+        Debug.println("buffer size: " + line.getBufferSize());
 
-        clip.start();
-        cdl.await();
-        clip.close();
+        line.open(targetAudioFormat);
+        volume(line, volume);
+        line.start();
+        int r;
+        byte[] buf = new byte[line.getBufferSize()];
+        while (true) {
+            r = ais.read(buf, 0, buf.length);
+            if (r < 0) {
+                break;
+            }
+//Debug.println("line: " + line.available());
+            line.write(buf, 0, r);
+        }
+        line.drain();
+        line.close();
 
         ais.close();
     }