When using the Gem WK4 as a master/controller.

I'm able to send program changes to a sound module. However, it only selects the GM soundset of the module. I need it to select the msb and the lsb of the module. Thsi would allow me to select the non-GM voices.
I did it yesterday by using the microscope mode on the WK4. But you have to do it for each(individual track of the sequence. This is very time consuming. Is there another way to do this or do I have to purchase something(a master controller that has more patch change/sound group buttone or selections)?

Thanks in advance!

Musical704@cs.com