I also think your arranger keyboard player does infact adjust eq on sounds but just the basic stuff, and maybe replace a drum kit or sound on a style. I was always told a yamaha is a good easy to understand keyboard for playing at home and a korg is very difficult to understand and maybe suited for stage only. After owning yamaha for years.. tyros, s900,s910..i heard a korg pa600 one day and could not believe how much better it sounded. And i actually found it easier to use and able to sound far better than i ever did with the yamahas... my lesson here was dont believe everything u read...I will never ever buy another yamaha product again. Ive since sold the pa600. Now i await either the pa700 or pa1000. Cant decide still.