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Deleted member 7164
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All the master tracks you have online of basically every band are sourced from Guitar Hero or in this case Rock Band. Unfortunately this means they're merged in strange ways, have leveling issues with things like fill-in guitars, synths and vocals, the mix is usually odd since everything's been EQ'd wrong, and they're pretty poor quality resulting in audible high-end distortion thanks to lossy compression.
I have the masters rip from GH/RB and the files are very good. I've worked with the tracks in audio projects and there is nothing wrong with them. Obviously your average Youtuber doesn't know how to mix audio. Not only that I have both "Hi-Fi" and monitoring audio systems where my ears can hear lossy, when you see peaks in the waveform you can pretty much be sure that these sources are OK.
Death Magnetic RIP from the same source sounds excellent, the album itself sucks compared to it.
There are some issues, mostly in modern production era, I believe on Wicker Man synths are throughout bass track or something like that. In Birch days they probably used 8 or 9 channels where guitars are doubled and you have drums lo-hi or something like that. It's easily bouncable to 5-ish track format these games require. Possibly they have a lot more tracks going on nowadays so when you auto-bounce something as Wicker Man to several instrument tracks only you get instruments where they don't belong. I assume.