What keyboard does Calvin harris use?

Answer 1

In an interview, found on the web he admits to using mostly Logic Pro. He uses outboard synths from time to time, but resamples them in Logic's EXS24 plugin. His argument for this is that through this method he finds that the tonality of the sound is altered through resampling.

In the same article, he also acknowledges that he will usually build on a preset on many of the synths that he uses.