James,
OK, I uderstnd now where you are comming from.

It's food for thouht at least...I have MIDI's up my Kurz and also a Yamaha sound moduel to th PA, And I have done the same to my PC Based E-MU 1820M with vSti's as well.

Works OK..but takes a lot of time for setup/balancing/etc. OK for studio. No so much for live if you have to cart it around.

Oe down side is that the PA2XPRO, while a heck of a lot better than the Tyros does not send MIDI for all the physical controls.
It is ot near the mastercontroller te OASYSY is.

Lee S.