This is one thing that always mystified me; putting the ARRANGER on TOP in a two-keyboard stack. The nature of arranger playing requires that the left hand be active 95% of the time and in that configuration it would always be in an elevated position. That would make me (left) arm-weary in about 15 min. of playing. Are you saying that this doesn't bother you? BTW, you are not the only one to reference this configuration. Wow, my arm aches just thinking about it (if I played arranger in a gig setting).

chas