Empress Effects Nebulus - Modulation Multi Effects PedalOverview The Nebulus brings guitarists high quality chorus, flanger and vibrato effects in a really compact 4. 5 by 3. 5 inch pedal. To increase the tone range even further 3 variations on each effect are available for a total of 9 tweak able modes. All this flexibility is easy to access via a preset system capable of storing up to 8 different presets. The chorus mode offers a lush and warm sounding chorus, a fluid and dreamy multi chorus, and a