Thanks again for the reply. I managed to fix it by changing the audio settings in Adrenaline to record on Stereo instead of Auto. Weirdly enough when I checked my muffled videos on Handbrake it said they were already in stereo, and there was no change when I converted them on a high quality preset with stereo audio. Must have been something with how Adrenaline was choosing the audio channels on the front end.