If you mean the sort of synthetic voice underneath the musical notes then it's produced using chorus and echo effects. The presets vary between the two applications but something with a title like "sci-fi" or "alien" might be a good place to start. You can then tweak the settings to suit your interests.
If you are looking for the synthesizer twang in the music, processing won't be quite as "bright" as the actual keyboard notes. Audition supports MIDI plug-ins, and the ability to playback MIDI tracks.
