OK I just hooked up my Edirol USB Audio Capture UA-25EX to my SC-55 and I can't hear any Midi yet.
I just hooked up OUT of SC into 25EX In and IN of SC into OUT of 25EX.
I also told BIAB and my computer about the changes (25EX as midi device).
I also disabled VSC in BIAB.

Anything else obvious I'm missing?

TIA