We get two audio tracks.
One of them has a message about turntables in base64 in the spectogram, which seems kinda useless.
So to get the difference between the tracks, I inverted track one, then used audacity to mix and render the two to a new track (effectively subtracting track1 from track2) giving us the flag in a spectogram.
rgbCTF{s3v3r3_1nv3r71g0}
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