GLTTR!

GLTTR! generates cascading noise that evolves over time. It's easy to use and even reacts to your playing when it feels like it. You can use it alone or with any sort of sound source plugged in, which will both affect the resulting textures and come through a bit dirtier than before. No matter what it will deliver that beautiful noise you crave. The secret to the GLTTR is the absolute abandonment of consonance and expectations.