How to have Scaler Detect audio coming into iPad over USB?

I added Scaler 2 as an AU inside Loopy Pro. I have digitized audio coming in over USB, can see it as a Loopy Pro input, and can record that audio in Loopy Pro. But I cannot figure out how to “route” that audio to Scaler2 AU so it will Detect that music and its chords. (I have the same question for non-AU use of Scaler2). Not sure if this is strictly a Scaler 2 question, but appreciate any help.