diff --git a/src/main/java/device/usbPlayer/UsbPlayer.java b/src/main/java/device/usbPlayer/UsbPlayer.java
index 0a6e75d..8e38ed0 100644
--- a/src/main/java/device/usbPlayer/UsbPlayer.java
+++ b/src/main/java/device/usbPlayer/UsbPlayer.java
@@ -104,6 +104,20 @@ public class UsbPlayer implements Device {
         }
     }
 
+    public void Louder_10(){
+        Lautstaerke += 10;
+        if (Lautstaerke > 100) {
+            Lautstaerke = 100;
+        }
+    }
+
+    public void quieter_10(){
+        Lautstaerke -= 10;
+        if (Lautstaerke < 0) {
+            Lautstaerke = 0;
+        }
+    }
+
     @Override
     public int getVolume() {
         return 0;
@@ -169,4 +183,32 @@ public class UsbPlayer implements Device {
 
     }
 
+    public int findSong(String songName){
+
+        int songIndex =-1, index=-1;
+        String song;
+
+        for (int j = 0; j < getPlaylist().size(); j++) {
+
+            song = getPlaylist().get(j);
+            songIndex=song.toLowerCase().indexOf(songName.toLowerCase());
+
+            if (songIndex != -1) {
+                index =  j;
+                break;
+            }
+        }
+        return index;
+    }
+
+    public boolean GoTo(String songName){
+        if(findSong(songName) != -1){
+            playTrack = getPlaylist().get(findSong(songName));//songName;
+            return true;
+        }
+        else
+        //playTrack = songName;
+        return false;
+    }
+
 }
diff --git a/src/test/java/device/usbPlayer/UsbPlayerTest.java b/src/test/java/device/usbPlayer/UsbPlayerTest.java
index 70c0f7a..2a613fb 100644
--- a/src/test/java/device/usbPlayer/UsbPlayerTest.java
+++ b/src/test/java/device/usbPlayer/UsbPlayerTest.java
@@ -114,7 +114,6 @@ void louderTest(String testName, UsbPlayer inputPlay, int expectedResult) {
         );
     }
 
-    ////////////////
     @ParameterizedTest
     @MethodSource("PrevOptions")
     void PrevTest(String testName, UsbPlayer inputPlay, String expectedResult) {
@@ -137,4 +136,111 @@ void louderTest(String testName, UsbPlayer inputPlay, int expectedResult) {
         );
     }
 
+    @ParameterizedTest
+    @MethodSource("louder_10_Options")
+    void louder_10_Test(String testName, UsbPlayer inputPlay, int expectedResult) {
+        int volumeNum = inputPlay.getLautstaerke();
+        assertThat(volumeNum).describedAs(testName).isEqualTo(expectedResult);
+    }
+
+    static Stream<Arguments> louder_10_Options() {
+        UsbPlayer up1 = new UsbPlayer();
+        up1.Louder_10();
+
+        UsbPlayer up2 = new UsbPlayer();
+        for (int i = 0; i <= 3; i++) {
+          up2.Louder_10();
+        }
+        up2.quieter_10();
+
+        UsbPlayer up3 = new UsbPlayer();
+        up3.setLautstaerke(100);
+        up3.Louder_10();
+        return Stream.of(
+                Arguments.of("Volume was 0, should be 10 ", up1, 10),
+                Arguments.of("Volume was 0, should be 30 ", up2, 30),
+                Arguments.of("Volume was 100, should stay 100 ", up3, 100)
+        );
+    }
+    @ParameterizedTest
+    @MethodSource("quieter_10_Options")
+    void quieter_10_Test(String testName, UsbPlayer inputPlay, int expectedResult) {
+        int volumeNum = inputPlay.getLautstaerke();
+        assertThat(volumeNum).describedAs(testName).isEqualTo(expectedResult);
+    }
+
+    static Stream<Arguments> quieter_10_Options() {
+        UsbPlayer up1 = new UsbPlayer();
+        up1.setLautstaerke(10);
+        up1.quieter_10();
+
+        UsbPlayer up2 = new UsbPlayer();
+        up2.setLautstaerke(50);
+        for (int i = 0; i < 3; i++) {
+            up2.quieter_10();
+        }
+
+        UsbPlayer up3 = new UsbPlayer();
+        up3.quieter_10();
+
+        return Stream.of(
+                Arguments.of("Volume was 10, should be 0 ", up1, 0),
+                Arguments.of("Volume was 50, should be 20 ", up2, 20),
+                Arguments.of("Volume was 0, should stay 0 ", up3, 0)
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("FindSongOptions")
+    void findSongTest(String testName, int inputPlay, int expectedResult) {
+        //first case: the song is not in the Album
+       // int songLoc1 = inputPlay.findSong("song 4");
+        assertThat(inputPlay).describedAs(testName).isEqualTo(expectedResult);
+        //Second Case: the song is in the album
+       // int songLoc2 = inputPlay.findSong("Musik 02");
+        assertThat(inputPlay).describedAs(testName).isEqualTo(expectedResult);
+
+    }
+
+    static Stream<Arguments> FindSongOptions() {
+        UsbPlayer up1 = new UsbPlayer();
+        return Stream.of(
+                Arguments.of("The song is not in the Album", up1.findSong("song 4"), -1),
+                Arguments.of("The song is in the Album", up1.findSong("Musik 02"), 1),
+                Arguments.of("Name of the Song is in lower case :", up1.findSong("musik 02"), 1),
+                Arguments.of("Name of the Song is in upper case :", up1.findSong("MUSIK 02"), 1)
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("GoToOptions")
+    void GoToTest(String testName, UsbPlayer inputPlay, String expectedResult) {
+        String current_Track = inputPlay.getPlayTrack();
+        assertThat(current_Track).describedAs(testName).isEqualTo(expectedResult);
+    }
+
+    static Stream<Arguments> GoToOptions() {
+        UsbPlayer up1 = new UsbPlayer();
+        up1.GoTo("Musik 03.mp3");
+
+        UsbPlayer up2 = new UsbPlayer();
+        up2.GoTo("Musik 04.mp3");
+
+        UsbPlayer up3 = new UsbPlayer();
+        up3.GoTo("Musik 02");
+
+        UsbPlayer up4 = new UsbPlayer();
+        up4.next();
+        up4.GoTo("Musik");
+
+        return Stream.of(
+                Arguments.of("Go to Song : Musik 03.mp3 ", up1, "Musik 03.mp3"),
+                Arguments.of("Go to Song that is not in the Album: Musik 04.mp3 ", up2, "Musik 01.mp3"),
+                Arguments.of("Go to Song without writing the full Name : Musik 02 ", up3, "Musik 02.mp3"),
+                Arguments.of("Go to Song and write a Name that many songs starts with : Musik", up4, "Musik 01.mp3")
+
+        );
+    }
+
+
 }
\ No newline at end of file