I realize this is an old post, but I'm having the same issue and it seems as though it was never really explained. Here is a simplified representation of the patch I'm trying to create:
The parent patch, on the left, is set to midi channel 1. It has a patcher object, shown on the right, which I have set to midi channel 2.
My intent is that the patcher object only respond to midi channel 2 inputs. The problem is I can find no combination of midi settings to create that result. I can get it to respond to channel 1, all channels, or no channels; but not channel 2 only. I've tried fiddling with the subpatch mode and the midi selector. Is there something else I should be doing here?