Judging from your audition, you seem like you really want this role, so I'm going to give some advice! Make sure to practice your lines well before making your recording, this way you don't sound like you and clicking back to read the lines on the audition. If you need a reference for your lines, I'd recommend dragging Audacity/the recording program you use to the bottom left/right side so you are able to read off the lines. I'm wondering, what mic do you use? If it's a plug in/head set always make sure in Audacity it's the correct mic, sometimes Audacity will switch to your built in mic! I hope none of this came off as rude, I'm wanting to help you for any future roles you take, so you get a good part in them!