The Lovetone Meatball is a rare envelope filter pedal produced in the 90s and used by many influential guitarists, such as Kirk Hammett. The effects created by the highly shapeable envelope filter produce sounds similar to an autowah or flange/phase pedals. Two sections are encapsulated in the Meatball: the Trigger section and Filter section. External effects can be placed in an effects loop after the trigger section and before the filter section.