Yes, it seems a impressive demo.
And I hope EXR-5 may play all Roland styles (as EM-25 do).

It has a 16 track sequencer, but I don't know if this kb let you to modify style parts (change tracks voices, for example).

I remember old E-30, E-50, EM-25, EM-55, don't let you modify them. You may only modify volume of drums, bass, and acc., (and only going into menus, not direct keys). It is all. No editing: no change voices, no effects, etc. for accompaniment parts.

It would be a pity if new EXR-5 play styles in so rigid way as old E series. Yamahas are going far away in it...

Any knowloedge about?