Hey Ned... sorry it took me so long to get back to you! Igor's been very needy ;)....
Actually, it' s real simple:
Every Cable Switcher and fader object have input setting with 4 parameters:
[b]Input:[/b] where you select the kind of input... you'll select [i]control[/i] for this!
[b]Channel:[/b] midi channel...duh!
[b]-1-:[/b] refers to the midi CC number you want to use control the switcher object! Pick one like 102 that isn't usually assigned to anything else!
[b]Range:[/b] in this case, how many outputs your cable switcher has!
Pick and program a hardware control knob or switch and match the controller's CC to the one you set on the switcher and if the cable switcher is patched in between the physical object and the sequencer you'll be able to controller the midi signal flow to different arpegiator settings! Let me know if you get it working...have fun!