Is there an on-line manual for the PA-500? I suspect it will do style assembly, but it would be nice to know for sure.

The $1000 (approx) Yamaha PSR-S710 has on-board style assembly...and it's around the same price as a Prelude.

I can't see why they can't add it to a Prelude with an OS upgrade. Style assembly on the keyboard is far better than in a PC...you can hear the changes real time, and test out all the chords it should play properly.

For the only arranger in their line-up, it's lagging behind pretty seriously...are they that fed up with arrangers?

There must be a PA-500 manual available on-line.

Ian