Sure, it can be done with an MOTL unit.

I think packaging in all those cool TOTL features, along with a great solid semi-weighted action (with aftertouch), must still necessarily be in the weight realm of mid 30's lbs. or so.

But, kudos to Roland all the same in keeping the weight so low (at more than half the weight of the G-70)...the BK-9 is a fine instrument and a good bang for the buck.

Ian