1DigitalJourney

Closed captioning on the screen is needed for people like this.

Just re-encode the videos with the audio settings I suggested. You will have to replace all of the videos in FCP however but its not hard just time consuming.

Your videos are making a popping noise in the audio. When you got these vids off of youtube, they were not the proper format for Final Cut Pro. You need to encode them with a sample rate of 48 kHz and a sample size of 16 bit to get rid of that crackle. I hope this helps.