Conversation so far:
What is JEM for Steve Vai?
Vai designed the Ibanez JEM guitar
What was unique about the Ibanez JEM guitar designed by Steve Vai?
a unique instrument that incorporated a series of groundbreaking designs that have since become staples in feature throughout the guitar industry
What was different about the Ibanez JEM guitar's sound
Vai says, Stratocasters had whammy bars but limited. Les Pauls had humbuckers but no whammy bar. Neither guitar had twenty-four frets. So I had these elements implemented into a Superstrat.“
What was Steve Vai's connection with Universe Guitars
Another design by Vai was the Ibanez Universe, the first production seven-string guitar

Question: Did he design any more guitars
Self-contained rewrite: Did Steve Vai design any more guitars