I never used it with the audio interface extending it, yet, I set it up as a sound interface.
I’m not sure what the status of what you are asking is, nor if someone from the community managed ever to successfully do it. Anyway, it would at this point be an experimental feature. Take a look at the “Hack” section of the MOD Wikis main page.
Did you also take a look at what @rolego did in this thread? More audio inputs? - #35 by rolego