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the following sections describe how to configure and activate input channel filters.
Active Filter
use the Active Filter drop-down list to select among active filters. selecting a filter highlights its node on the graph
and displays its current settings. you can configure up to four active filters per input channel.
NOTE: there are no filters configured by default. press the Add Filter button to create a filter for
the input channel. When you add a filter, it appears in the Active Filter drop-down list,
and on the active filter graph.
In graph view, you can click on a filter node and drag it to the desired location on the graph. the setting fields
immediately reflect changes made by dragging filter nodes.