The 42/B is a perfect balance between size and facility.
Only 9.5kg in weight but with a 42 note range on both the Right hand and freebass keyboards this allows you to cover a huge amount of repertoire.
The right hand has 72 buttons giving you a range of 42 notes from E to F and is a 3 voice model. This is available as double octave or as a 2 voice unison with an octave lower.
The left hand has 102 bass stradella keyboard that converts to a 42 note freebass with a note range G to C.