Not to high jack your post,Jonathan, but may I ask if anybody has ever made any commercially successful album using an arranger keyboard? Major soundtracks? How about major touring acts that feature an arranger keyboard stage? I guess I ask this because I wonder if Mozart or the Beatles would even consider an arranger keyboard over all the possible methods of creating music now days.
Several high profile Ketron owners I know reguarly use their Ketorn Arrangers for Television, Film Production, Soundtracks for West End shows and Music Production (when working with vocalists). Not sure about other arrangers though.