In this Software video tutorial you will learn how to use tool shortcuts in Final Cut Pro. To change opacity and the volume limit, click the little mountain button on the bottom and you will have two lines in the clip representing audio lines of two mono tracks. And you also have opacity located above the audio lines. With the help of the slide bar you can set the opacity. To get the pen tool press 'P'. To get out of any tool, press 'A'. To delete the entire audio track, select it, lock, delete and unlock it. If you want to learn all key commands, click on tools > keyboard layout > customize. It will display all key commands.