You want to change the routing with the patch. That is much more easy, just save the patch with the selected routing. Forget what I said about assigning stuff, that is if you want to make changes in the patch haha.
Well... It doesn't seem to be working.
What I've tested so far.
Applied to all patches
1/4" Input Jack R/MONO = Instrument 1
1/4" Input Jack L = Instrument 2
Divider 1 is placed first
Divider 1 is in SINGLE / SELECTOR mode
Icon for two inputs is enabled
Applied to Patch Specifically for Bass #1
Div1 Ch1 is active
Has effects etc
Editor indicates that the signal goes from the top Input to Div1 Ch1
Works fine / appears to be normal output
Applied to Patch Specifically for Bass #2
Div1 Ch2 is active
Editor indicates that the signal goes from the bottom Input to Div2 Ch2
Does not work / no output
Second try
Applied to all patches
1/4" Input Jack R/MONO = Instrument 1
1/4" Input Jack L = Instrument 2
Divider 1 is placed first
Divider 1 is in DUAL / SELECTOR mode
Icon for two inputs is enabled
Input R/MONO jack appears to use Div1 Ch2
Input L appears to use Div1 Ch2
Hiss is doubled
I don't think I can use the two inputs to skip the A/B. Looks like the inputs are designed for stereo. Womp womp....