Yo Fran,
I have the Midjay too. Some of the things I do require only the midi accordion and module. For some gigs I midi the accordion to the PA800 and for others I just use the PA800. Ultimatly, I'd like to build a keytar-like strap on controller with bass buttons like the old Baldoni Midi-Accord, and play it through a PA800M or PA2XM (module). By the time Korg offers a PA based module, I should have my accordkeytar controller finished.
Ciao,
Jerry