diff --git a/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/activities/SettingsActivity.java b/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/activities/SettingsActivity.java
index e5065b3f..706e12db 100644
--- a/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/activities/SettingsActivity.java
+++ b/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/activities/SettingsActivity.java
@@ -218,6 +218,9 @@ else if (SystemUtil.isAppInstalled(Application.getResourceString(R.string.packag
 			PreferenceUtil.setAllHints(!showTips);
 			// always show tips for first use
 			PreferenceUtil.setSharedPreferenceBoolean(R.string.key_tip_firstuse, false);
+			// always show hint on max volume for external LED
+			PreferenceUtil.setSharedPreferenceBoolean(R.string.key_tip_external_flash, false);
+
 			PreferenceUtil.setSharedPreferenceBoolean(R.string.key_internal_initialized_hints, true);
 		}
 
diff --git a/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/util/AudioUtil.java b/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/util/AudioUtil.java
index 96bd7b26..67c9c978 100644
--- a/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/util/AudioUtil.java
+++ b/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/util/AudioUtil.java
@@ -64,8 +64,8 @@ public static AudioTrack generateTone(final double freqHz, final int durationMs)
 	public static AudioTrack generateHighFreqTone(final int durationMs) {
 		int count = (int) (BITRATE * 2.0 * (durationMs / MILLIS_IN_SECOND)) & ~1;
 		short[] samples = new short[count];
-		for (int i = 0; i < count; i += 2) {
-			short sample = TONE_MAP[(i / 2) % 4]; // MAGIC_NUMBER
+		for (int i = 0; i < count; i += 2) { // MAGIC_NUMBER
+			short sample = TONE_MAP[(i / 4) % 4]; // MAGIC_NUMBER
 			samples[i] = sample;
 			samples[i + 1] = sample;
 		}
diff --git a/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/util/Camera1Handler.java b/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/util/Camera1Handler.java
index 5ff64f79..f4a17b22 100644
--- a/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/util/Camera1Handler.java
+++ b/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/util/Camera1Handler.java
@@ -355,7 +355,7 @@ public final void takePicture() {
 			}
 		}
 
-		mCamera.takePicture(mShutterCallback, null, mPhotoCallback);
+		mCamera.takePicture(mShutterCallback, mRawCallback, mPhotoCallback);
 	}
 
 	/**
@@ -432,10 +432,19 @@ public void onPictureTaken(final byte[] data, final Camera photoCamera) {
 	private final ShutterCallback mShutterCallback = new ShutterCallback() {
 		@Override
 		public void onShutter() {
+			mCameraCallback.onTakingPicture();
+		}
+	};
+
+	/**
+	 * The callback called when pictures are taken.
+	 */
+	private final PictureCallback mRawCallback = new PictureCallback() {
+		@Override
+		public void onPictureTaken(final byte[] data, final Camera photoCamera) {
 			if (mUseExternalFlash && mExternalFlashBeep != null) {
 				mExternalFlashBeep.stop();
 			}
-			mCameraCallback.onTakingPicture();
 		}
 	};
 
diff --git a/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/util/Camera2Handler.java b/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/util/Camera2Handler.java
index bd9f953a..ba0672ee 100644
--- a/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/util/Camera2Handler.java
+++ b/AugendiagnoseIdea/augendiagnoseLib/src/main/java/de/jeisfeld/augendiagnoselib/util/Camera2Handler.java
@@ -284,6 +284,10 @@ public void onError(@NonNull final CameraDevice cameraDevice, final int error) {
 	private final ImageReader.OnImageAvailableListener mOnImageAvailableListener = new ImageReader.OnImageAvailableListener() {
 		@Override
 		public void onImageAvailable(@NonNull final ImageReader reader) {
+			if (mUseExternalFlash && mExternalFlashBeep != null) {
+				mExternalFlashBeep.stop();
+			}
+
 			Image image = reader.acquireNextImage();
 			ByteBuffer buffer = image.getPlanes()[0].getBuffer();
 			byte[] data = new byte[buffer.remaining()];
@@ -352,9 +356,6 @@ else if (CaptureResult.CONTROL_AF_STATE_FOCUSED_LOCKED == afState
 				}
 				break;
 			case STATE_TAKING_PICTURE_END:
-				if (mUseExternalFlash && mExternalFlashBeep != null) {
-					mExternalFlashBeep.stop();
-				}
 				mCameraCallback.onTakingPicture();
 				mState = CameraState.STATE_PICTURE_TAKEN;
 				break;