I noticed in an interview with Carl Verheyen from Guitar Magazine that he uses a "Costa Lab Chorus" pedal. Carl is a ex Supertramp guitarist and does music for Movies etc. So I thought if Carl is using this pedal it must be good as Carl is very meticulous with his music. I could not find any schematics but here is a link to a Review on this pedal.
http://www.gilmourish.com/?p=2944
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