Just discovered this fascinating YouTube vid clip today.
Custom Made Korg Pa1000 Arranger Moduleforall788 converted his Korg Pa1000 arr keyboard into an arranger module. It 'looks' very impressive.

Curious how and where a remote 61/76/88 note midi controller keyboard connects to it. Via midi ports on the back or the multi-pin connector plugs on the bottom of the module?
Would love to see a live arranger mode demo with this module & remote midi controller keyboard connected.
Scott