Click the RC-20 logo to open the About Page.

Click the Preset Name or the LOAD button to open the Preset Browser. From here you can load any of the included ("XLN Audio") presets as well as the ones you've created and saved yourself ("User Presets"). Save your own User Presets by clicking the SAVE button.

The Magnitude slider works as a "global" amount control for the entire plugin. It basically controls all six big knobs at once, as well as the controls in the bottom Master Section (In, Out and EQ). This means you can go from a dry unprocessed sound to full blast wobbly distorted mayhem using only this one (automatable) slider.

In the top right corner, the Menu button lets you open this manual, change UI size, go to xlnaudio.com, open the User Folder where Presets are stored and things like that.