If you describe me the way to measure that level with a multimeter, I can do it.
Sometimes I notice a small downing in the volume on some higher parts of the songs, the transitions are very smooth, so they don´t interfere with the listening. After that high point, the volume slowly returns to its initial state.
But probably in my specific case this correction is done on the TV amplifier input, not inside the Enterprise, because the mixed sound is very clear on all instances.
For me the effect is very similar to the auto-level that the tape recorders incorporated from mid 80's.
I have to try the same song section with other monitors or amplifiers.
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May be you can understand the
inners of the
Dave chip.