Actual-level comparisons
Hear what the master changes.
Choose a track, keep your place, and switch between the original mix and the mastered file. The level difference is part of the result.
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Mastering samples
What you are hearing
No hidden loudness matching.
The mastered side plays the same MP3 offered for download, at its delivered loudness. The original plays at its own level. Use the measurements to understand the level change, then listen for balance, punch, width, and tone.
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Your track is the useful test