I totally understand where you're coming from... I have a PSR-550 and I have the same problem when using XG works in regards to the lack of "instrument difinition" for my keyboard. That's really a**holish of Yamaha to just drop this support. They could have at least provided the definitions for the current gear if anything.

Squeak
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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.