Hi Mike

I would steer clear of any Yamaha Organ/Arranger if you wish to use it as a controller, as they are very poor in this department, (The Korg will leave any of them for dead with this type of use) however as an expander they are brilliant, as virtually everything on-board can be accessed externally. (Takes a bit of working out as the manuals are not what they could be, but if you have a good understanding of Midi you can work it out)

You will also find Pro Studios have a set of networked Mac computers (Plus a couple of Windows computers) all connected to the hardware they have, in which they also have the best plug-ins available.

Spalding is correct about the vast majority are home studios, but once you have got used to a Workstation/DAW going back to doing everything on even the best arranger is just a pain in the backside. Spalding is also correct when he say for most users an arranger is all they will need, except one, in that they are way more expensive then Workstations and musicians hate spending money. However once you have got stuck into a Workstation/DAW then an Organ/Arranger becomes a pain in the backside.

Bill