It also shows why arranger modules are so incredible versatile...

Weather you add them to
-an organ like the Wersi or a Hammomd(clone)
-a stage piano like the nord stage 3 or Roland RD2000
-a fullfledged workstation like the Korg kronos
-a performance synth like the yamaha Montage
-a midified accodeon

If done smart, it turms any instrument into a fullfledged arranger with an extra set of solo/sounds on top of that..

A module is the answer for many people that want more then a typical arranger.. And yet, you only have Ketron as a real contender in this segment(you could also consider the Varranger, or a use Roland BK7, if you want to spend less)