Niles Audio CPM-31 patching matrix question

[bamavette]

I opened this up to work on the switches and seen the 3.3K resistors that are in series with the inputs. I am trying to figure out the reason for those resistors in a passive switching device.
Any ideas?

 

[Mark Tillotson]

Summing resistors?

 

[bamavette]

Summing resistors?

I thought about that but was just guessing.

 

[Mark Tillotson]

So am I, but I think its a reasonable guess!