Surface filters are used to increase or decrease the amplitude of selected spectral components.
Filters must be first created, then their value can be defined.
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The resulting filter will be automatically converted into a basic grey surface filter. It will be first superimposed on the blue time/frequency region, which will disappear when unselected.
Note that filters are continuous surfaces, contrary to time frequency regions.
A standard " Surface Filter" block will be displayed in the processing sequencer.