Thanks for the comments. I have listened to the tracks separately and they are both the same as each other. It’s not an issue of the sound being too quiet, it has decent volume but is crackled and unusable. I would assume it was a problem with my cable, but the fact that it works fine in Quicktime makes me wonder. I have restarted the machine and tried on different machines and it is the same on both, so I’m very confused.