This is the Soft Synth Properties window for a VST instrument.

To change the preset, choose a setting from the Preset drop-down list or click the Open Effect Preset button to browse to a preset (.fxp) file.

You can click the keys on the piano keyboard in the Soft Synth Properties window to preview the selected sound. The Enable button must be selected to use the keyboard.

When you are ready to continue, click the Next button.