Marcus Padrini from MusicApps.com.br did a tutorial on how you can creat the classic Vangelis-ish "String Machine" sound on just about any synth. For purposes of demonstration he's using a Korg Minilogue, Roland FA07, and iOS app Magellan!
Although he is speaking in Portuguese, Marcus has included built-in English YouTube captions.
Seven steps to create a basic, but cool, synth patch that resembles the sounds of string machines and other synthesizers used by musicians such as Jean Michel Jarre, Vangelis, etc.
Synths used in the example: Korg Minilogue, Roland FA07 and Magellan for iPad.