I agree. I've spent more time here at the general arranger forum than I have in any of the other ones, and a part of that is because it isn't brand specific. Also, there is good input and there are good storylines here and in a way you really do get to know your fellow musicians, even if you never meet in person.
The other forums listed here are all good too. I especially like Simon's, and I still read it often even though I currently do not have a Yamaha arranger. Jorgen's site is outstanding, and I have found many tools and things that are useful even if I don't have a PSR. I don't like the Yahoo format very much, but the forums themsleves ( PSR styles, PSR2000, XG works etc ) are also very good.
AJ
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AJ