Squeak_D,
Here I am. Good morning.
I don't have the voice definitions file for the PSR550. Bryan "Pilot" says he has them.
If you get it from him, could you please send me a copy. Pilot is real big on XG voices. I noticed your questions on the SYXG-50, it might not be necessary to get that, since XG Works will convert your 550 into a powerfull synth.
Starkeeper