Something simple I hope:
it can be useful to have a start device with only 1 in and 1 out,
and another with 2 ins/2 outs.
I'm thinking expecially for use the modular as effect processor (so no midi).
This permits to have the routing window less occupied.
another thing: its possible to have some modules like the AUDIO-IN/OUT MIDI-IN/OUT present in reaktor?