The next class is soundManager. This one is pretty simple and you surely can write it yourself. There are no create methods required, only methods which play a particular sound. You will write these methods:
This class also needs only one instance, so you should create the a SoundManager below the class definition. Once done, you can create a little test in which you press keys to play a certain sound. Ensure that all sounds equally loud. If necessary, you can adjust the volume of certain sounds.