diff --git a/engines/hdb/sound.cpp b/engines/hdb/sound.cpp
index d7967e2fb90..bd310094eda 100644
--- a/engines/hdb/sound.cpp
+++ b/engines/hdb/sound.cpp
@@ -61,6 +61,16 @@ bool Sound::startMusic(SoundType song) {
 	return true;
 }
 
+bool Sound::fadeInMusic(SoundType song, int ramp) {
+	warning("STUB: Fade In Music");
+	return true;
+}
+
+void Sound::fadeOutMusic(int ramp) {
+	warning("STUB: Fade Out Music");
+	return;
+}
+
 bool Sound::songPlaying(SoundType song) {
 	warning("STUB: Check if Song is playing");
 	return true;
@@ -75,6 +85,11 @@ void Sound::stopMusic() {
 	debug(9, "STUB: Stop Music");
 }
 
+int Sound::registerSound(const char *name) {
+	debug(9, "STUB: Register Sound");
+	return 0;
+}
+
 bool Sound::freeSound(int index) {
 	debug(9, "STUB: Free Sound");
 	return true;
diff --git a/engines/hdb/sound.h b/engines/hdb/sound.h
index 895f6d95065..3cbb5fb17c6 100644
--- a/engines/hdb/sound.h
+++ b/engines/hdb/sound.h
@@ -1417,9 +1417,12 @@ public:
 	bool playSoundEx(int index, int channel, bool loop);
 	bool playVoice(int index, int actor);
 	bool startMusic(SoundType song);
+	bool fadeInMusic(SoundType song, int ramp);
+	void fadeOutMusic(int ramp);
+	void stopMusic();
 	bool songPlaying(SoundType song);
 	bool stopChannel(int channel);
-	void stopMusic();
+	int registerSound(const char *name);
 	bool freeSound(int index);
 
 	SoundType whatSongIsPlaying();