I'm trying to remember the last time I saw someone playing piano with their forearms. They must have been playing a lot of 'block chords' . I agree with you on this statement though, ("An arranger keyboard is played using finger movement") as it takes a lot of finger dexterity to manipulate all those buttons, knobs, switches, and sliders all while trying to read the lyrics (except for Donny, who has them all memorized ) on that tiny screen. Anyway, according to your theory, Popeye must have been a helluva piano player .

chas