How to record from an aggregate device, stream to output, and save to file?

Question

I'm looking for a free macOs Sierra application that supports at the same time:

• Multiple Inputs or Aggregate Device recording
• Streaming to a selected output (And not the default one)
• Saving the recordings to a *.mp3 file

Hope some of you have ideas, Google ran out of it... I tried VLC but couldn't manage multiple inputs and aggregate devices. I tried Quicktime but you can't select another output. Looked for GarageBand but I discovered you have to pay for it now.

Thanks for your help.

MacBook Air running latest macOs Sierra

Answer 1

Solution found: https://github.com/mattingalls/Soundflower/releases/ It allows you to use your mac's sound output as an input. Works perfectly if combined with GarageBand.