Analog Keys - how can i tweak tracks 2,3,4 without sending track 1 notes

When im controlling multiple tracks with an external sequencer and i want to change some of the parameters of tracks 2,3,4; my sequence going into track 1 (midi ch1) is playing thru the other tracks.
How do i prevent this from happening?
I’m sure its somewhere in the manual, but its not very clear to me.