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An upward compressor increases levels below a threshold, instead of decreasing levels above it. This is closely related to an expander; the upward compressor can be seen as an expander with ratio in the [0,1] range. This can be used for example when the game audio is lowered against a voice track but that one still wants to be able to hear very low game sounds. For more use cases: https://www.izotope.com/en/learn/4-tips-for-using-upwards-compression-in-neutron.html Signed-off-by: pkv <pkv@obsproject.com>