A-Ha,
Andres Calamaro from Los Rodriguez,
Tony Banks of Genesis,
Karl Bartos of Kraftwerk,
John Beck of It Bites,
James Brown Band,
Cabaret-Voltaire,
Ray Charles,
Coil,
The Cure,
Depeche Mode,
George Duke,
D:Ream,
Electronic Dream Planet (with Yellinghouse DX-programmer),
Brian Eno,
Enya,
Front 242,
Herbie Handcock,
James Ingram,
Jens Johansson from Stratovarius,
Michael Jackson - from 1983 to 1990,
Al Jarreau,
Kitaro,
John Lord of Deep Purple,
Chris Lowe,
NINGoldie and Rob Playford,
Steve Porcaro and David Paich of TOTO,
The Smiths,
Stabbing-Westward,
Talking Heads,
Type O Negative,
U2,
Underworld,
Eddie Van Halen - on "Love Walks In",
Stevie Wonder - on "Ribbon in the Sky",
Vangelis
[Let us know if you have any further additions to this list.]