So I just tried what you described and it worked the way it should. That is all 4 GRA modules are receiving all 4 input signals from the input module. IE: the 4 input signals are getting summed and fed to each of the GRA modules.
To do what you want you would need to use 4 input modules each only connected to one GRA module.
This is because there is an automated connection system in place, that allows you to connect many modules and SUM signals. If you don’t want that you use an individual input or midi module.
It is possible that there is a bug here, because if the other GRA modules are not showing 4 incoming signals as well on the pitch input that would be wrong. I, however, did not have this problem. In fact I use this feature a lot when making multi layer voice patches.
In the above picture I have 1 input with inputs 1 through 4 enabled on the first analog input row. I have the input module connected to the 4 granular modules. From the output of the input module I have 1, 2, 3, and 4 of GRA pitch enabled. On each of the 4 GRA modules I have GRA pitch enabled on the module’s input section. This then shows 4 connections within each GRA module.
Could you let me know if I didn’t do something the way you did? Or if you have anything else I might be missing?