The A-37 has dedicated buttons for lower, upper and split sections of the keyboard. The split point can be set wherever you wish. In addition you have two MIDI outs. With this keyboard I have it attached to a Technics KN7000 (and other sound modules)via a Midi Merge box and so control left split (arranger section) and right split (melody) on the KN7000. The purpose is to give me 76 keys to play with!
Keith