Hi, I have these 3 synths hooked up as external instruments in Logic and I would like to control and automate each one and its knobs individually for each synth... I cant seem to get it to work. Either one of the synths (the one with USB MIDI plugged in) is always acting as a master and when I turn the filter cutoff or other knobs and buttons it controls the other 2 synths as well. I dont have a multi-midi interface and not sure if it has anything to do with midi channels... is that what i need or how i do i control each one of them without afftecting the others? Thanks!