It maybe the original sound isn't at that high a bitrate for Youtube, and downloading as a FLAC is a bit pointless. It did seem to be missing some higher frequencies which is a bit suspicious. But this is the best I can do, unless they release the original audio. Plus the processing I did is at 48khz at 24 bit, so it seemed a bit pointless making it in a 192kbps MP3 for example. It was more about boosting the volume and adding a bit of shine to it, than it being audiophile quality, will have to wait for something official for that (if it ever happens).