AudioScope
Why Did the Second Note Get Quieter?
Listen for the second note in each pair. The input and playback gain stay fixed while the compressor release changes.
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Listen for what carries over
In this model, the loud note triggers gain reduction. With the 450 ms release, more of that reduction is still present when the quiet note begins. That note measures about 6.6 dB lower than with the 45 ms release.
The test uses an original synthesized signal and a compressor model with a 3 ms attack, −18 dB threshold and 4:1 ratio. The measurement covers 8–100 ms into the second note. The playback gain is the same for both passes.
Audio Engineering Society paper on digital compressor design