Sorry, but without the dynamics provided by the use of an expression pedal, it just lacks excitement (IMO). Unless it's Rock Organ where everything is balls-to-the-wall, playing jazz organ without using an expression pedal just doesn't cut it for me.

chas

PS: Of course this doesn't mean one couldn't be used with the BK9, assuming it could be set up to only effect the right hand lead (of course then you'd lose the dynamics on the bass line).