Kurzweil are grandees of the big, complex, workstation-style keyboard world, with a history going back to the early '80s, and a remarkable legacy of products. The current Kurzweil pro-keyboard line-up encompasses stage pianos, workstations and, in the case of the PC4 on test here, 'Performance Controllers'. The name could be misleading: this is not just a MIDI controller (though it's capable of that), but a workstation-like synth in its own right. Whatever you want to call it, the PC4 sits in the middle of the Kurzweil range; more expensive and complex than the SP stage pianos, but cheaper than the Forte–series workstation and Artis stage piano. There is as yet a single 88-note version, but it wouldn't surprise me if a 76–note counterpart appeared at some stage.