i got the audio4+ and here is my setup:
2 mics (and potentially one more) going into 4+ to my iPad Pro, headphones out to well, headphones.
The software I am using currently is GarageBand.
I am setting up for a podcast, no video recording at this point.
However, I wanted to know how to record a Skype (or similar) AP into garage band, and have the guest be able to hear me, and the music etc that is played during the show.