i am running vegas with a motu 2408mkIII. i have a lexicon reverb unit with spidif I/O and i simply connect it to the motu spdif i/o. i then create a buss and route it to the spdif channel. i use the aux send from the track i want the reverb on to send to the buss. then i create another track on the timeline and use this for the return. when i find or create what sound i want, i record it to the track and mix the level acordingly.