You can do pretty much anything you want with any keyboard, however it is easier if you use a keyboard that is designed for the job in hand, hence the different groups.

Arrangers are designed for the home player and thus the manufacture has set everything up to make this simple.

Workstations are designed for production and live band play, which means having everything setup (As in an arranger) is a hindrance not an asset.

Combining the 2 would be great, but no pro musician is going to pay arranger prices for stuff they will hardly ever use, and home players usually complain at why they should pay for all the in depth editing and production (Workstation) software that they don’t understand.

This is the reason manufactures produce 2 separate lines, as otherwise they would lose sales all round.

Adding a pedalboard to an arranger has been common in Europe for years, as it gets rid of the boring & repetitive bass lines that arranges produce, (A lot of manufactures support team produce USB sticks that users can purchase to set up the arranger for a pedalboard with no setup required) over the last couple or 3 years adding a second keyboard has also started to become common. (They are bought mainly by those who used to buy organs but have now moved over to arrangers, but after a time finds the flexibility of the arranger to be too limited compared to organ, but still want all the arranger features)

Bill