If i owned a company and was looking to create the perfect arranger... I would take some of the most active spokesman of the keyboard forum communities and lock them together in a room and let them design the features and user interface of the perfect arranger and then build it...

If you put Eilleen of PSR tutorial and James (sharp) of Korg forums and Diki of Roland keyboard club into a single room, with their very own outspoken visions, you would get the arranger filled with features and a great UI for direct controll that would make everyone happy..

I am not kidding, but these 3 people each with a different viewpoint on arrangers but also extreme insight in their own and the userbase wishes based on long and extensive playing experience, these people know so much better what the perfect arranger needs to be from a players perspective.. All they need to add is some engineers that decide if the options are technically possible with the current technollogy..

I think i would blindly buy the keyboard...