A groovebox is similar to a Music Workstation[?] except that it doesn't have a keyboard and generally includes more user controls.
"Groovebox" type instruments include:
... artist May 17 - Jean Gabin[?], actor (+ 1976) May 21 - Fats Waller, pianist (+ 1943) May 21 - Robert Montgomery, actor (+ 1981) June 2 - Johnny ...