RX modules share several common controls.
Presets:
From the Presets drop down menu, you can select from default presets and presets you have saved.

Add/Remove Preset - create a new preset
Remove Preset - remove a preset from the drop down list
Rename Preset - change the name of a preset
Move Preset Up/Down - change the order of presets
Import Preset - import a preset saved by another user or on another computer
Export Preset - save a preset to share or transfer to another computer
Preview:
In each of the modules, you can click the preview button to hear a process before you apply it to your file. With some settings, processing may take longer than real time. Preview buffers playback for a set period of time to allow you to hear the process settings.
Preview Button - click this button to start a preview of selected audio
Preview Options (+):

Process Buttons:
Apply - applies the module to the audio file or a current selection
Compare - send the current settings of the module to the Compare Settings window to audition against other settings
Batch - include the module's settings in a batch process