this is already covered in my how to thread
you have a choices
a) map multiple controllers onto channels 1-16, then in orac you can select midi channel in chain
(i.e. just use different midi channels for each controller)
b) use -mididev in pd-opts.txt to attach multiple channels grouped, 1-16,17-32,33-48 etc.
then use midi channels in chain
if your controller is not able to select midi channel to send on (then after complaining to the manufacturer it should do), use option b, which will put midi channel 1 , 17 etc.
if you do use over channel 16, you will find orac limits selection in the router module 
but have no fear, I rarely hard code anything…
go to the router module, open module.json, and there you see midi channel, change range to your new range
e.g. 0-128 
(0=off, so keep zero)