Right, lets say we use USB3.0/ Lightning port or bluetooth, which are all digital. Audio input goes into my mac program from a bluetooth/USB mic, then gets proc

Right, lets say we use USB3.0/ Lightning port or bluetooth, which are all digital. Audio input goes into my mac program from a bluetooth/USB mic, then gets processed there, and then sends the digital data stream as an audio output to the iphone via USB/bluetooth. The iphone reads that as a digital audio stream input and its apps can use it accordingly. The audio stream would of course be incoherent, but say someone on the other end of the apps can decrypt it.