Hi,
you may want to check out the capabilities of the KN5000 as a controller keyboard thoroughly, before you consider buying a module. I sold my kn5000 approx 12 years ago, too long ago for me to remember the midi functions. There is an actual Technics forum on Synthzone. Maybe someone there could help as far as the Technics goes.

Sorry, can't help as far as Audya or Yamaha goes, I'm a Korg owner.
[quote=philip2000]
1)is the audya 4 basically an audya 5 without the keys?----would that hook up to a technics kn5000?