Grid 64 and _sum

How does the grid 64 work with _sum, meaning how do you toggle surface to get the second grouping of sounds and locations? I have only used a 128 so I am not familiar with how this would work…

Any help is appreciated.

I’ve just got an old grids 64 and sum was included in the installation package.
I’m not sure how it works on the 128 but I have to do some clicking with my pointer on the screen.

I understand I need to click around to change programs, but I’m more interested in how does what you see on the 128 -across all the pads- change when you have only 8 across as opposed the 16 on the g128?

You can change the mapping of the Routing key that are used for selecting app/tab/program or whatever it’s called.
See the sum routing documentation