Audio quality is excellent, the only real issue is the lack of a few songs from various acts, I count 6 at least (green hill, oil ocean, and chemical plant). The quality as I said is great though, it has a lot more bass and oomph than you might notice on the game.
Only reason I give it 4/5 is the missing tracks, but still a great soundtrack for the best Sonic game in a good 15 years.
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