Dear Cassp;

With respect to the knobs/sliders etc.. one would assign the functions to which buttons you choose. So it would function just like an arranger. secondly,dues to prgrams like OMB, live styler, the left hand function with chord recognition just like an arranger. I maybe wrong, but it looks like you are thinking that all the functions would be contrlled via a computer screen. This does not have to be the case. Its all their infront of you. The current situation of arrangers is limited by its software/hardware that the manufacturers place inside.

I suppose to each his own, but Cassp I don't want you to be close minded about it ( its not as complicated as it sounds). These configuration would be much more powerful to the user, and allows for limitless possibilities. By using the prefab KBs as we have been doing for years, precludes us to accept what ever the manufuactures want to give us.

PS--there are companies that have modular based softsynth arrangers in the typical familiar layout that you have described ( i.e. with pre-assigened buttons etc..)

Regards;
BN