diff --git a/android/app/src/main/java/io/github/kichikuou/system3/GameActivity.kt b/android/app/src/main/java/io/github/kichikuou/system3/GameActivity.kt
index f01b960..0dead25 100644
--- a/android/app/src/main/java/io/github/kichikuou/system3/GameActivity.kt
+++ b/android/app/src/main/java/io/github/kichikuou/system3/GameActivity.kt
@@ -43,6 +43,7 @@ class GameActivity : SDLActivity() {
     private lateinit var gameRoot: File
     private lateinit var cdda: CddaPlayer
     private val midi = MidiPlayer()
+    private var useFM = true
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -70,7 +71,8 @@ class GameActivity : SDLActivity() {
     override fun getArguments(): Array<String> {
         return arrayOf(
                 "-gamedir", intent.getStringExtra(EXTRA_GAME_ROOT),
-                "-savedir", intent.getStringExtra(EXTRA_SAVE_DIR) + "/@")
+                "-savedir", intent.getStringExtra(EXTRA_SAVE_DIR) + "/@",
+                "-fm")
     }
 
     override fun setTitle(title: CharSequence?) {
@@ -110,9 +112,10 @@ class GameActivity : SDLActivity() {
         menuShown = true
     }
 
-    override fun onCreateContextMenu(menu: ContextMenu?, v: View?, menuInfo: ContextMenu.ContextMenuInfo?) {
+    override fun onCreateContextMenu(menu: ContextMenu, v: View?, menuInfo: ContextMenu.ContextMenuInfo?) {
         super.onCreateContextMenu(menu, v, menuInfo)
         menuInflater.inflate(R.menu.game_menu, menu)
+        menu.findItem(if (useFM) R.id.fm_sound else R.id.midi_sound).isChecked = true
     }
 
     override fun onContextItemSelected(item: MenuItem): Boolean {
@@ -121,6 +124,16 @@ class GameActivity : SDLActivity() {
                 finish()
                 true
             }
+            R.id.fm_sound -> {
+                selectSynthesizer(true)
+                useFM = true
+                true
+            }
+            R.id.midi_sound -> {
+                selectSynthesizer(false)
+                useFM = false
+                true
+            }
             else -> super.onOptionsItemSelected(item)
         }
     }
@@ -130,6 +143,9 @@ class GameActivity : SDLActivity() {
         menuShown = false
     }
 
+    // C functions we call
+    private external fun selectSynthesizer(use_fm: Boolean)
+
     // The functions below are called in the SDL thread by JNI.
     @Suppress("unused") fun cddaStart(track: Int, loop: Boolean) = cdda.start(track, loop)
     @Suppress("unused") fun cddaStop() = cdda.stop()
diff --git a/android/app/src/main/res/menu/game_menu.xml b/android/app/src/main/res/menu/game_menu.xml
index 40698c6..4abd7ad 100644
--- a/android/app/src/main/res/menu/game_menu.xml
+++ b/android/app/src/main/res/menu/game_menu.xml
@@ -3,4 +3,10 @@
     <item
         android:id="@+id/quit_game"
         android:title="@string/action_quit_game" />
+    <group android:checkableBehavior="single">
+        <item android:id="@+id/fm_sound"
+            android:title="@string/sound_fm" />
+        <item android:id="@+id/midi_sound"
+            android:title="@string/sound_midi" />
+    </group>
 </menu>
\ No newline at end of file
diff --git a/android/app/src/main/res/values-ja/strings.xml b/android/app/src/main/res/values-ja/strings.xml
index cad5acd..d7dd781 100644
--- a/android/app/src/main/res/values-ja/strings.xml
+++ b/android/app/src/main/res/values-ja/strings.xml
@@ -16,6 +16,8 @@
     <string name="save_data_export_error">セーブデータのエクスポートに失敗しました。</string>
     <string name="save_data_export_success">エクスポートに成功しました。</string>
     <string name="save_data_import_success">インポートに成功しました。</string>
+    <string name="sound_fm">FM音源</string>
+    <string name="sound_midi">MIDI音源</string>
     <string name="uninstall_dialog_message">「%s」をアンインストールしますか？</string>
     <string name="uninstall_dialog_title">確認</string>
     <string name="unsupported_zip">この形式の ZIP はサポートしていません。</string>
diff --git a/android/app/src/main/res/values/strings.xml b/android/app/src/main/res/values/strings.xml
index ccbb015..96ee1f1 100644
--- a/android/app/src/main/res/values/strings.xml
+++ b/android/app/src/main/res/values/strings.xml
@@ -16,6 +16,8 @@
     <string name="save_data_export_error">Failed to export save files.</string>
     <string name="save_data_import_success">Imported successfully.</string>
     <string name="save_data_export_success">Exported successfully.</string>
+    <string name="sound_fm">FM sound</string>
+    <string name="sound_midi">MIDI sound</string>
     <string name="uninstall_dialog_message">Uninstall \"%s\"?</string>
     <string name="uninstall_dialog_title">Confirm</string>
     <string name="unsupported_zip">This type of ZIP is not supported.</string>
diff --git a/src/android/mako.cpp b/src/android/mako.cpp
index a59e2ef..6f4f045 100644
--- a/src/android/mako.cpp
+++ b/src/android/mako.cpp
@@ -9,6 +9,7 @@
 
 namespace {
 
+MAKO *g_mako;
 SDL_mutex* fm_mutex;
 std::unique_ptr<MakoFMgen> fm;
 
@@ -21,11 +22,12 @@ void audio_callback(void*, Uint8* stream, int len) {
 } // namespace
 
 MAKO::MAKO(NACT* parent, const MAKOConfig& config) :
-	use_fm(true),	// TODO: make it switchable
+	use_fm(config.use_fm),
 	current_music(0),
 	next_loop(0),
 	nact(parent)
 {
+	g_mako = this;
 	strcpy(amus, "AMUS.DAT");
 	for (int i = 1; i <= 99; i++)
 		cd_track[i] = 0;
@@ -159,3 +161,21 @@ bool MAKO::check_pcm()
 {
 	return false;
 }
+
+void MAKO::select_synthesizer(bool use_fm_) {
+	if (use_fm == use_fm_)
+		return;
+	int page = current_music;
+	stop_music();
+	use_fm = use_fm_;
+	play_music(page);
+}
+
+extern "C" {
+
+JNIEXPORT void JNICALL Java_io_github_kichikuou_system3_GameActivity_selectSynthesizer(
+	JNIEnv *env, jobject cls, jboolean use_fm) {
+	g_mako->select_synthesizer(use_fm);
+}
+
+} // extern "C"
diff --git a/src/sys/mako.h b/src/sys/mako.h
index 42472a7..ddc213a 100644
--- a/src/sys/mako.h
+++ b/src/sys/mako.h
@@ -45,7 +45,7 @@ public:
 	void select_sound(BGMDevice dev);
 	void on_mci_notify(const SDL_SysWMmsg* msg);
 #endif
-#ifdef __EMSCRIPTEN__
+#if defined(__EMSCRIPTEN__) || defined(__ANDROID__)
 	void select_synthesizer(bool use_fm);
 #endif