There's 2 ways to do that:
On the TimeFactor you will have to create a midi program change map (RCV MAP) . This is explained in the manual page 49. This could also be done via the H9 control software.
Or you can simply make the GigRig G2 to send the appropriate Program change. I don't have access to the manual but this certainly could be done as it is a basic feature for a controller.
LA
