It is not 2 different things controlled by 1 CC that @SPIKE_the_Percussion is mentioning. If I understand correct, he is trying to send different CC messages for PAN and Filter Cutoff, but on the same channel.
I tried this myself and my observation is the same. You cannot expect the machine to respond on different midi channels, although they are both set to the same channel number. The first pad (alphabetically) will respond, all others won’t.