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J. wrote:
Is there such a thing as a plugin that will "round out" the frequencies of a
track in real time? Something that will do to the EQ display what a
compressor does to the volume output?

A de-esser will push down when a set frequency (generally high but
often can be slid down fairly low) exceeds a threshold. It can push
down the whole track or just the set frequency. It's usually used to
control sibilence but you can also set it to keep a sound from popping
out without dulling it when not at the threshold.