Disklavier

Hi everyone
I have come to some conclusions about limitations that the DKC850 unit brings when replacing an older unit (DKC500R on a MKIIXG (silent) upright piano (mpx1)...

I have found that the DKC850:

-Cannot record multitrack midi sequences- (was possible with older unit)

-Cannot record incoming midi data - (was possible with older unit)

-Cannot output midi data other than live piano playing (no playing of stored midi files)- (was possible with older unit)

-Soundcard quality worst than older  unit

-Audio line output very soft

-Does not playback the high resolution data (PRO X) midi files 

Can you give me confirmation of these and/or add other comments... ?

Thanks