Chorus, echo and reverb are the cornerstone of electro-acoustic instrument playing. It'd be kinda useful to have them all in one pedal. The Mr. Black Ambience combines two modulated rhythmic delays and and a modulated ambient reverb into a pedal for a massive, lush sound controlled by only three knobs. What's it sound like? I'd say palominos waltzing, but that's just me. Check out my review for the obsessive details: