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SC4 is a stereo compressor with a variable envelope follower for RMS / peak behavior. Unlike the built-in Compressor, SC4 does not "look-ahead" in order to begin reducing volume before a peak occurs.

Warning icon From version 2.3.0 of Audacity onwards we will no longer be shipping SC4 as part of Audacity,

You can obtain SC4 if you want/need it as part of the available LADSPA bundle. Please see the LADSPA section of the Download page on the Audacity Website for more details and links.

See the Talk page for how it used to work (which is not very well).


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