It features bass guitarist Jaco Pastorius on the track "4 A.M.," plus multiple guests including Bennie Maupin, Sheila E. and Ron Carter, plus an all-synthesizer track ("Textures") performed entirely by Hancock.
"4 A.M." includes the bass playing of Jaco Pastorius, alongside contributions from Bennie Maupin, Sheila E., and Ron Carter.  The album also features a track called "Textures," entirely composed on synthesizers by Hancock.