Actually Martin has as HUGE role in the keyboard development at Yamaha. He's the one who does the PSR-S500 video demo on the Yamaha USA site..., and he give a brief description of his job with Yamaha.
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.