you want to play pedals, lower and upper manuals all at the same time using the VR09 engine and possibly its keyboard?
There is a discussion on this board over on Keyboard Central, I think it has midi inputs for a lower manual and pedal board. you could use the rd150 midi out as one of the manuals, you still need a pedal board..
I have NI B4II and simulate lower and upper manuals with an 88 key controller split at C4 outputing two different midi channels on the respective zones for the lower and upper manuals