connecting synth & module to 001

[j old school]

How do you connect a synth with built in sounds, and a separate sound module simultaneously in midi for both devices to receive midi messages from Pro Tools? I also want the sound module to recieve midi messages from my synth (use synth as controller).

Do I need a separate midi interface? I can connect one or the other, but not both. Any ideas?

[ptrbas]

From the synth: midi out> Digi midi in
midi in > Digi midi out
midi thru> sound module midi in
Make sure local is off in the synth.
Give the synth and the sound module separate midi channels. For example the synth channel 1-8, the module 9-16.

Pieter