Okay, the second one this funny. Luigi went up the slope.
I know how to fix the audio.
No scratches, I mean, clean up the scratches from the audio. Then make it more loud. Last, but not least is to put up the final touch. The final touch is the "Does it work?" part. If it works, then try from the video again. If not, go back to the 1st step which is step 1.