The Decay Color and EQ section provides an editable graphic display of reverb decay color parameters and EQ parameters. Click the EQ button to toggle the display to show EQ parameters. Click the Color button to toggle the display to show Color parameters. To edit a parameter on the graph, drag the appropriate dot.
Each control point (dot) on the graph has corresponding parameter text fields above the display that show the current parameter values. You can edit the numeric value of a parameter with your computer keyboard. (
See Editing Parameters with a Computer Keyboard.)