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Small stompbox with two effects - vibrato and tremolo. You may want to get more depth from this thing, but you won't. Still, it can give you smooth vibrato sound to your guitar and interesting tremolo sounds. You can tweak it's waves to choose type of sound that you need. I won't say that it's agressive, but good enough. Also you can get stereo sounds from it, which is great. As I said it lacks some depth if you want real extreme settings. Also there's a volume boost in tremolo mode which can dissapoint you. It's OK and cheap.